diff --git a/js-server/package.json b/js-server/package.json
index 9b06379..0fae244 100644
--- a/js-server/package.json
+++ b/js-server/package.json
@@ -11,13 +11,15 @@
   "license": "ISC",
   "packageManager": "pnpm@10.30.3",
   "dependencies": {
-    "@types/adm-zip": "^0.5.7",
+    "@fastify/mongodb": "^10.0.0",
+    "@fastify/static": "^9.0.0",
     "adm-zip": "^0.5.16",
     "dotenv": "^17.3.1",
     "fastify": "^5.7.4",
     "mongodb": "^7.1.0"
   },
   "devDependencies": {
+    "@types/adm-zip": "^0.5.7",
     "@types/node": "^24.10.13",
     "tsx": "^4.21.0",
     "typescript": "~5.8.3"
diff --git a/js-server/src/server.ts b/js-server/src/server.ts
index e69de29..82890b6 100644
--- a/js-server/src/server.ts
+++ b/js-server/src/server.ts
@@ -0,0 +1,27 @@
+import fastify from "fastify";
+import { readdirSync } from "fs";
+import path from "path";
+
+import fastifyStatic from "@fastify/static";
+
+const app = fastify({
+  logger: true,
+});
+
+const YOMITAN_PATH = path.join(__dirname, "../src-tauri/resources/yomitan/ja");
+
+app.register(fastifyStatic, {
+  root: YOMITAN_PATH,
+  prefix: "/api/files/yomitan/ja",
+});
+
+app.get("/api/yomitan/ja/list", async () => {
+  return {
+    list: readdirSync(YOMITAN_PATH).filter((p) => p.endsWith(".zip")),
+  };
+});
+
+app.listen({ port: 3000 }).catch((e) => {
+  app.log.error(e);
+  process.exit(1);
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 9d70bd0..3a4a4c2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -14,9 +14,12 @@ importers:
 
   js-server:
     dependencies:
-      '@types/adm-zip':
-        specifier: ^0.5.7
-        version: 0.5.7
+      '@fastify/mongodb':
+        specifier: ^10.0.0
+        version: 10.0.0
+      '@fastify/static':
+        specifier: ^9.0.0
+        version: 9.0.0
       adm-zip:
         specifier: ^0.5.16
         version: 0.5.16
@@ -30,6 +33,9 @@ importers:
         specifier: ^7.1.0
         version: 7.1.0
     devDependencies:
+      '@types/adm-zip':
+        specifier: ^0.5.7
+        version: 0.5.7
       '@types/node':
         specifier: ^24.10.13
         version: 24.10.13
@@ -397,6 +403,9 @@ packages:
     cpu: [x64]
     os: [win32]
 
+  '@fastify/accept-negotiator@2.0.1':
+    resolution: {integrity: sha512-/c/TW2bO/v9JeEgoD/g1G5GxGeCF1Hafdf79WPmUlgYiBXummY0oX3VVq4yFkKKVBKDNlaDUYoab7g38RpPqCQ==}
+
   '@fastify/ajv-compiler@4.0.5':
     resolution: {integrity: sha512-KoWKW+MhvfTRWL4qrhUwAAZoaChluo0m0vbiJlGMt2GXvL4LVPQEjt8kSpHI3IBq5Rez8fg+XeH3cneztq+C7A==}
 
@@ -412,9 +421,18 @@ packages:
   '@fastify/merge-json-schemas@0.2.1':
     resolution: {integrity: sha512-OA3KGBCy6KtIvLf8DINC5880o5iBlDX4SxzLQS8HorJAbqluzLRn80UXU0bxZn7UOFhFgpRJDasfwn9nG4FG4A==}
 
+  '@fastify/mongodb@10.0.0':
+    resolution: {integrity: sha512-BBkX8i3XjeQ2XJLLozVfYb2KF6boFqQf6UeX6f+LUWqbpnJbhD0euMqbTUiZkswgeyoydF09fq3eaCle6bQpIA==}
+
   '@fastify/proxy-addr@5.1.0':
     resolution: {integrity: sha512-INS+6gh91cLUjB+PVHfu1UqcB76Sqtpyp7bnL+FYojhjygvOPA9ctiD/JDKsyD9Xgu4hUhCSJBPig/w7duNajw==}
 
+  '@fastify/send@4.1.0':
+    resolution: {integrity: sha512-TMYeQLCBSy2TOFmV95hQWkiTYgC/SEx7vMdV+wnZVX4tt8VBLKzmH8vV9OzJehV0+XBfg+WxPMt5wp+JBUKsVw==}
+
+  '@fastify/static@9.0.0':
+    resolution: {integrity: sha512-r64H8Woe/vfilg5RTy7lwWlE8ZZcTrc3kebYFMEUBrMqlydhQyoiExQXdYAy2REVpST/G35+stAM8WYp1WGmMA==}
+
   '@floating-ui/core@1.7.4':
     resolution: {integrity: sha512-C3HlIdsBxszvm5McXlB8PeOEWfBhcGBTZGkGlWc2U0KFY5IwG5OQEuQ8rq52DZmcHDlPLd+YFBK+cZcytwIFWg==}
 
@@ -446,6 +464,10 @@ packages:
   '@jridgewell/trace-mapping@0.3.31':
     resolution: {integrity: sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==}
 
+  '@lukeed/ms@2.0.2':
+    resolution: {integrity: sha512-9I2Zn6+NJLfaGoz9jN3lpwDgAYvfGeNYdbAIjJOqzs4Tpc+VU3Jqq4IofSUBKajiDS8k9fZIg18/z13mpk1bsA==}
+    engines: {node: '>=8'}
+
   '@mongodb-js/saslprep@1.4.6':
     resolution: {integrity: sha512-y+x3H1xBZd38n10NZF/rEBlvDOOMQ6LKUTHqr8R9VkJ+mmQOYtJFxIlkkK8fZrtOiL6VixbOBWMbZGBdal3Z1g==}
 
@@ -989,11 +1011,19 @@ packages:
     resolution: {integrity: sha512-Cg7TFGpIr01vOQNODXOOaGz2NpCU5gl8x1qJFbb6hbZxR7XrcE2vtbAsTAbJ7/xwJtUuJEw8K8Zr/AE0LHlesg==}
     engines: {node: '>=10', npm: '>=6'}
 
+  balanced-match@4.0.4:
+    resolution: {integrity: sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==}
+    engines: {node: 18 || 20 || >=22}
+
   baseline-browser-mapping@2.10.0:
     resolution: {integrity: sha512-lIyg0szRfYbiy67j9KN8IyeD7q7hcmqnJ1ddWmNt19ItGpNN64mnllmxUNFIOdOm6by97jlL6wfpTTJrmnjWAA==}
     engines: {node: '>=6.0.0'}
     hasBin: true
 
+  brace-expansion@5.0.4:
+    resolution: {integrity: sha512-h+DEnpVvxmfVefa4jFbCf5HdH5YMDXRsmKflpf1pILZWRFlTbJpxeU55nJl4Smt5HQaGzg1o6RHFPJaOqnmBDg==}
+    engines: {node: 18 || 20 || >=22}
+
   browserslist@4.28.1:
     resolution: {integrity: sha512-ZC5Bd0LgJXgwGqUknZY/vkUQ04r8NXnJZ3yYi4vDmSiZmC/pdSN0NbNRPxZpbtO4uAfDUAFffO8IZoM3Gj8IkA==}
     engines: {node: ^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7}
@@ -1010,6 +1040,10 @@ packages:
   caniuse-lite@1.0.30001770:
     resolution: {integrity: sha512-x/2CLQ1jHENRbHg5PSId2sXq1CIO1CISvwWAj027ltMVG2UNgW+w9oH2+HzgEIRFembL8bUlXtfbBHR1fCg2xw==}
 
+  content-disposition@1.0.1:
+    resolution: {integrity: sha512-oIXISMynqSqm241k6kcQ5UwttDILMK4BiurCfGEREw6+X9jkkpEe5T9FZaApyLGGOnFuyMWZpdolTXMtvEJ08Q==}
+    engines: {node: '>=18'}
+
   convert-source-map@1.9.0:
     resolution: {integrity: sha512-ASFBup0Mz1uyiIjANan1jzLQami9z1PoYSZCiiYW2FczPbenXc45FZdBZLzOT+r6+iciuEModtmCti+hjaAk0A==}
 
@@ -1036,6 +1070,10 @@ packages:
       supports-color:
         optional: true
 
+  depd@2.0.0:
+    resolution: {integrity: sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==}
+    engines: {node: '>= 0.8'}
+
   dequal@2.0.3:
     resolution: {integrity: sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==}
     engines: {node: '>=6'}
@@ -1059,6 +1097,9 @@ packages:
     resolution: {integrity: sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==}
     engines: {node: '>=6'}
 
+  escape-html@1.0.3:
+    resolution: {integrity: sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow==}
+
   escape-string-regexp@4.0.0:
     resolution: {integrity: sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==}
     engines: {node: '>=10'}
@@ -1078,6 +1119,9 @@ packages:
   fast-uri@3.1.0:
     resolution: {integrity: sha512-iPeeDKJSWf4IEOasVVrknXpaBV0IApz/gp7S2bb7Z4Lljbl2MGJRqInZiUrQwV16cpzw/D3S5j5Julj/gT52AA==}
 
+  fastify-plugin@5.1.0:
+    resolution: {integrity: sha512-FAIDA8eovSt5qcDgcBvDuX/v0Cjz0ohGhENZ/wpc3y+oZCY2afZ9Baqql3g/lC+OHRnciQol4ww7tuthOb9idw==}
+
   fastify@5.7.4:
     resolution: {integrity: sha512-e6l5NsRdaEP8rdD8VR0ErJASeyaRbzXYpmkrpr2SuvuMq6Si3lvsaVy5C+7gLanEkvjpMDzBXWE5HPeb/hgTxA==}
 
@@ -1115,6 +1159,10 @@ packages:
   get-tsconfig@4.13.6:
     resolution: {integrity: sha512-shZT/QMiSHc/YBLxxOkMtgSid5HFoauqCE3/exfsEcwg1WkeqjG+V40yBbBrsD+jW2HDXcs28xOfcbm2jI8Ddw==}
 
+  glob@13.0.6:
+    resolution: {integrity: sha512-Wjlyrolmm8uDpm/ogGyXZXb1Z+Ca2B8NbJwqBVg0axK9GbBeoS7yGV6vjXnYdGm6X53iehEuxxbyiKp8QmN4Vw==}
+    engines: {node: 18 || 20 || >=22}
+
   hasown@2.0.2:
     resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
     engines: {node: '>= 0.4'}
@@ -1122,10 +1170,17 @@ packages:
   hoist-non-react-statics@3.3.2:
     resolution: {integrity: sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw==}
 
+  http-errors@2.0.1:
+    resolution: {integrity: sha512-4FbRdAX+bSdmo4AUFuS0WNiPz8NgFt+r8ThgNWmlrjQjt1Q7ZR9+zTlce2859x4KSXrwIsaeTqDoKQmtP8pLmQ==}
+    engines: {node: '>= 0.8'}
+
   import-fresh@3.3.1:
     resolution: {integrity: sha512-TR3KfrTZTYLPB6jUjfx6MF9WcWrHL9su5TObK4ZkYgBdWKPOFoSoQIdEuTuR82pmtxH2spWG9h6etwfr1pLBqQ==}
     engines: {node: '>=6'}
 
+  inherits@2.0.4:
+    resolution: {integrity: sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==}
+
   ipaddr.js@2.3.0:
     resolution: {integrity: sha512-Zv/pA+ciVFbCSBBjGfaKUya/CcGmUHzTydLMaTwrUUEM2DIEO3iZvueGxmacvmN50fGpGVKeTXpb2LcYQxeVdg==}
     engines: {node: '>= 10'}
@@ -1165,12 +1220,29 @@ packages:
   lines-and-columns@1.2.4:
     resolution: {integrity: sha512-7ylylesZQ/PV29jhEDl3Ufjo6ZX7gCqJr5F7PKrqc93v7fzSymt1BpwEU8nAUXs8qzzvqhbjhK5QZg6Mt/HkBg==}
 
+  lru-cache@11.2.6:
+    resolution: {integrity: sha512-ESL2CrkS/2wTPfuend7Zhkzo2u0daGJ/A2VucJOgQ/C48S/zB8MMeMHSGKYpXhIjbPxfuezITkaBH1wqv00DDQ==}
+    engines: {node: 20 || >=22}
+
   lru-cache@5.1.1:
     resolution: {integrity: sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==}
 
   memory-pager@1.5.0:
     resolution: {integrity: sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==}
 
+  mime@3.0.0:
+    resolution: {integrity: sha512-jSCU7/VB1loIWBZe14aEYHU/+1UMEHoaO7qxCOVJOw9GgH72VAWppxNcjU+x9a2k3GSIBXNKxXQFqRvvZ7vr3A==}
+    engines: {node: '>=10.0.0'}
+    hasBin: true
+
+  minimatch@10.2.4:
+    resolution: {integrity: sha512-oRjTw/97aTBN0RHbYCdtF1MQfvusSIBQM0IZEgzl6426+8jSC0nF1a/GmnVLpfB9yyr6g6FTqWqiZVbxrtaCIg==}
+    engines: {node: 18 || 20 || >=22}
+
+  minipass@7.1.3:
+    resolution: {integrity: sha512-tEBHqDnIoM/1rXME1zgka9g6Q2lcoCkxHLuc7ODJ5BxbP5d4c2Z5cGgtXAku59200Cx7diuHTOYfSBD8n6mm8A==}
+    engines: {node: '>=16 || 14 >=14.17'}
+
   mongodb-connection-string-url@7.0.1:
     resolution: {integrity: sha512-h0AZ9A7IDVwwHyMxmdMXKy+9oNlF0zFoahHiX3vQ8e3KFcSP3VmsmfvtRSuLPxmyv2vjIDxqty8smTgie/SNRQ==}
     engines: {node: '>=20.19.0'}
@@ -1234,6 +1306,10 @@ packages:
   path-parse@1.0.7:
     resolution: {integrity: sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==}
 
+  path-scurry@2.0.2:
+    resolution: {integrity: sha512-3O/iVVsJAPsOnpwWIeD+d6z/7PmqApyQePUtCndjatj/9I5LylHvt5qluFaBT3I5h3r1ejfR056c+FCv+NnNXg==}
+    engines: {node: 18 || 20 || >=22}
+
   path-type@4.0.0:
     resolution: {integrity: sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==}
     engines: {node: '>=8'}
@@ -1363,6 +1439,9 @@ packages:
   set-cookie-parser@2.7.2:
     resolution: {integrity: sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==}
 
+  setprototypeof@1.2.0:
+    resolution: {integrity: sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==}
+
   sonic-boom@4.2.1:
     resolution: {integrity: sha512-w6AxtubXa2wTXAUsZMMWERrsIRAdrK0Sc+FUytWvYAhBJLyuI4llrMIC1DtlNSdI99EI86KZum2MMq3EAZlF9Q==}
 
@@ -1381,6 +1460,10 @@ packages:
     resolution: {integrity: sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==}
     engines: {node: '>= 10.x'}
 
+  statuses@2.0.2:
+    resolution: {integrity: sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==}
+    engines: {node: '>= 0.8'}
+
   stylis@4.2.0:
     resolution: {integrity: sha512-Orov6g6BB1sDfYgzWfTHDOxamtX1bE/zo104Dh9e6fqJ3PooipYyfJ0pUmrZO2wAvO8YbEyeFrkV91XTsGMSrw==}
 
@@ -1400,6 +1483,10 @@ packages:
     resolution: {integrity: sha512-/m8M+2BJUpoJdgAHoG+baCwBT+tf2VraSfkBgl0Y00qIWt41DJ8R5B8nsEw0I58YwF5IZH6z24/2TobDKnqSWw==}
     engines: {node: '>=12'}
 
+  toidentifier@1.0.1:
+    resolution: {integrity: sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==}
+    engines: {node: '>=0.6'}
+
   tr46@5.1.1:
     resolution: {integrity: sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==}
     engines: {node: '>=18'}
@@ -1851,6 +1938,8 @@ snapshots:
   '@esbuild/win32-x64@0.27.3':
     optional: true
 
+  '@fastify/accept-negotiator@2.0.1': {}
+
   '@fastify/ajv-compiler@4.0.5':
     dependencies:
       ajv: 8.18.0
@@ -1869,11 +1958,41 @@ snapshots:
     dependencies:
       dequal: 2.0.3
 
+  '@fastify/mongodb@10.0.0':
+    dependencies:
+      fastify-plugin: 5.1.0
+      mongodb: 7.1.0
+    transitivePeerDependencies:
+      - '@aws-sdk/credential-providers'
+      - '@mongodb-js/zstd'
+      - gcp-metadata
+      - kerberos
+      - mongodb-client-encryption
+      - snappy
+      - socks
+
   '@fastify/proxy-addr@5.1.0':
     dependencies:
       '@fastify/forwarded': 3.0.1
       ipaddr.js: 2.3.0
 
+  '@fastify/send@4.1.0':
+    dependencies:
+      '@lukeed/ms': 2.0.2
+      escape-html: 1.0.3
+      fast-decode-uri-component: 1.0.1
+      http-errors: 2.0.1
+      mime: 3.0.0
+
+  '@fastify/static@9.0.0':
+    dependencies:
+      '@fastify/accept-negotiator': 2.0.1
+      '@fastify/send': 4.1.0
+      content-disposition: 1.0.1
+      fastify-plugin: 5.1.0
+      fastq: 1.20.1
+      glob: 13.0.6
+
   '@floating-ui/core@1.7.4':
     dependencies:
       '@floating-ui/utils': 0.2.10
@@ -1912,6 +2031,8 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  '@lukeed/ms@2.0.2': {}
+
   '@mongodb-js/saslprep@1.4.6':
     dependencies:
       sparse-bitfield: 3.0.3
@@ -2705,8 +2826,14 @@ snapshots:
       cosmiconfig: 7.1.0
       resolve: 1.22.11
 
+  balanced-match@4.0.4: {}
+
   baseline-browser-mapping@2.10.0: {}
 
+  brace-expansion@5.0.4:
+    dependencies:
+      balanced-match: 4.0.4
+
   browserslist@4.28.1:
     dependencies:
       baseline-browser-mapping: 2.10.0
@@ -2721,6 +2848,8 @@ snapshots:
 
   caniuse-lite@1.0.30001770: {}
 
+  content-disposition@1.0.1: {}
+
   convert-source-map@1.9.0: {}
 
   convert-source-map@2.0.0: {}
@@ -2741,6 +2870,8 @@ snapshots:
     dependencies:
       ms: 2.1.3
 
+  depd@2.0.0: {}
+
   dequal@2.0.3: {}
 
   dotenv@17.3.1: {}
@@ -2782,6 +2913,8 @@ snapshots:
 
   escalade@3.2.0: {}
 
+  escape-html@1.0.3: {}
+
   escape-string-regexp@4.0.0: {}
 
   fast-decode-uri-component@1.0.1: {}
@@ -2803,6 +2936,8 @@ snapshots:
 
   fast-uri@3.1.0: {}
 
+  fastify-plugin@5.1.0: {}
+
   fastify@5.7.4:
     dependencies:
       '@fastify/ajv-compiler': 4.0.5
@@ -2848,6 +2983,12 @@ snapshots:
     dependencies:
       resolve-pkg-maps: 1.0.0
 
+  glob@13.0.6:
+    dependencies:
+      minimatch: 10.2.4
+      minipass: 7.1.3
+      path-scurry: 2.0.2
+
   hasown@2.0.2:
     dependencies:
       function-bind: 1.1.2
@@ -2856,11 +2997,21 @@ snapshots:
     dependencies:
       react-is: 16.13.1
 
+  http-errors@2.0.1:
+    dependencies:
+      depd: 2.0.0
+      inherits: 2.0.4
+      setprototypeof: 1.2.0
+      statuses: 2.0.2
+      toidentifier: 1.0.1
+
   import-fresh@3.3.1:
     dependencies:
       parent-module: 1.0.1
       resolve-from: 4.0.0
 
+  inherits@2.0.4: {}
+
   ipaddr.js@2.3.0: {}
 
   is-arrayish@0.2.1: {}
@@ -2891,12 +3042,22 @@ snapshots:
 
   lines-and-columns@1.2.4: {}
 
+  lru-cache@11.2.6: {}
+
   lru-cache@5.1.1:
     dependencies:
       yallist: 3.1.1
 
   memory-pager@1.5.0: {}
 
+  mime@3.0.0: {}
+
+  minimatch@10.2.4:
+    dependencies:
+      brace-expansion: 5.0.4
+
+  minipass@7.1.3: {}
+
   mongodb-connection-string-url@7.0.1:
     dependencies:
       '@types/whatwg-url': 13.0.0
@@ -2934,6 +3095,11 @@ snapshots:
 
   path-parse@1.0.7: {}
 
+  path-scurry@2.0.2:
+    dependencies:
+      lru-cache: 11.2.6
+      minipass: 7.1.3
+
   path-type@4.0.0: {}
 
   perfect-freehand@1.2.3: {}
@@ -3064,6 +3230,8 @@ snapshots:
 
   set-cookie-parser@2.7.2: {}
 
+  setprototypeof@1.2.0: {}
+
   sonic-boom@4.2.1:
     dependencies:
       atomic-sleep: 1.0.0
@@ -3078,6 +3246,8 @@ snapshots:
 
   split2@4.2.0: {}
 
+  statuses@2.0.2: {}
+
   stylis@4.2.0: {}
 
   supports-preserve-symlinks-flag@1.0.0: {}
@@ -3093,6 +3263,8 @@ snapshots:
 
   toad-cache@3.7.0: {}
 
+  toidentifier@1.0.1: {}
+
   tr46@5.1.1:
     dependencies:
       punycode: 2.3.1
diff --git a/src-core/examples/add_yomitan_dict_folder.rs b/src-core/examples/add_yomitan_dict_folder.rs
index 9d4fb40..96e5af0 100644
--- a/src-core/examples/add_yomitan_dict_folder.rs
+++ b/src-core/examples/add_yomitan_dict_folder.rs
@@ -1,11 +1,10 @@
 use std::{
     fs::read_dir,
     path::{Path, absolute},
-    time::Instant,
 };
 
 use anyhow::{Context, Ok};
-use cjdic2_core::AppService;
+use cjdic2_core::{AppService, Timer};
 
 mod common;
 use common::get_db_dir;
@@ -24,16 +23,14 @@ fn main() -> Result<(), anyhow::Error> {
         let p = e.path();
 
         if p.extension().and_then(|s| s.to_str()) == Some("zip") {
-            let start = Instant::now();
+            let _timer = Timer::new(format!("zip_file: {:?}", p));
 
-            println!("zip_file: {:?}", p);
             println!(
                 "{:?}",
                 AppService::import_yomitan_zip_file(&mut writer, &p, "ja", |progress| {
                     println!("{:?}", progress);
                 })?,
             );
-            println!("[{:.2?}]", start.elapsed());
         } else {
             println!("not zip_file: {:?}", p);
         }
diff --git a/src-core/examples/remove_one_yomitan_dict.rs b/src-core/examples/remove_one_yomitan_dict.rs
index cd861e9..698d154 100644
--- a/src-core/examples/remove_one_yomitan_dict.rs
+++ b/src-core/examples/remove_one_yomitan_dict.rs
@@ -1,7 +1,5 @@
-use std::time::Instant;
-
 use anyhow::Ok;
-use cjdic2_core::AppService;
+use cjdic2_core::{AppService, Timer};
 
 mod common;
 use common::get_db_dir;
@@ -9,10 +7,11 @@ use common::get_db_dir;
 fn main() -> Result<(), anyhow::Error> {
     let service = AppService::new(get_db_dir())?;
 
-    let start = Instant::now();
-    let mut writer = service.get_yomitan_writer()?;
-    AppService::remove_yomitan_dictionary(&mut writer, "JMnedict")?;
-    println!("[{:.2?}]", start.elapsed());
+    {
+        let _timer = Timer::new("remove one".to_string());
+        let mut writer = service.get_yomitan_writer()?;
+        AppService::remove_yomitan_dictionary(&mut writer, "JMnedict")?;
+    }
 
     Ok(())
 }
diff --git a/src-core/examples/search_yomitan.rs b/src-core/examples/search_yomitan.rs
index 5fa9e1a..12ea1b7 100644
--- a/src-core/examples/search_yomitan.rs
+++ b/src-core/examples/search_yomitan.rs
@@ -1,7 +1,5 @@
-use std::time::Instant;
-
 use anyhow::Ok;
-use cjdic2_core::AppService;
+use cjdic2_core::{AppService, Timer};
 
 mod common;
 use common::get_db_dir;
@@ -9,11 +7,12 @@ use common::get_db_dir;
 fn main() -> Result<(), anyhow::Error> {
     let service = AppService::new(get_db_dir())?;
 
-    let start = Instant::now();
-    let rs = service.search_yomitan("擦る", "する", 10, 0)?;
-    println!("{:#?}", rs);
-    println!("n={}", rs.len());
-    println!("[{:.2?}]", start.elapsed());
+    {
+        let _timer = Timer::new("Search".to_string());
+        let rs = service.search_yomitan("擦る", "する", 10, 0)?;
+        println!("{:#?}", rs);
+        println!("n={}", rs.len());
+    }
 
     Ok(())
 }
diff --git a/src-core/examples/yomitan_update_schema.rs b/src-core/examples/yomitan_update_schema.rs
index 2e2d858..5e4683b 100644
--- a/src-core/examples/yomitan_update_schema.rs
+++ b/src-core/examples/yomitan_update_schema.rs
@@ -1,9 +1,5 @@
-
-
-use std::time::Instant;
-
 use anyhow::Ok;
-use cjdic2_core::AppService;
+use cjdic2_core::{AppService, Timer};
 
 mod common;
 use common::get_db_dir;
@@ -11,9 +7,10 @@ use common::get_db_dir;
 fn main() -> Result<(), anyhow::Error> {
     let service = AppService::new(get_db_dir())?;
 
-    let start = Instant::now();
-    service.get_yomitan_writer()?;
-    println!("[{:.2?}]", start.elapsed());
+    {
+        let _timer = Timer::new("update schema".to_string());
+        service.get_yomitan_writer()?;
+    }
 
     Ok(())
 }
diff --git a/src-core/src/db.rs b/src-core/src/db.rs
index 0a7e396..5f4f7d2 100644
--- a/src-core/src/db.rs
+++ b/src-core/src/db.rs
@@ -38,6 +38,7 @@ impl Database {
             PRAGMA jornal_mode = WAL;
             PRAGMA synchronous = NORMAL;
             PRAGMA foreign_keys = ON;
+            PRAGMA cache_size = -131072;
             ",
         )?;
 
@@ -81,6 +82,13 @@ impl Database {
             let uri = format!("file:{}?mode=ro&immutable=1", path);
 
             conn.execute("ATTACH DATABASE ?1 AS yomitan", [uri])?;
+
+            conn.execute_batch(
+                r"
+                PRAGMA yomitan.mmap_size = 3000000000; -- 3_000_000_000
+                ",
+            )?;
+
             self.yomitan_attached.store(true, Ordering::Release);
         }
 
diff --git a/src-core/src/db/yomitan.rs b/src-core/src/db/yomitan.rs
index 058e811..c495a86 100644
--- a/src-core/src/db/yomitan.rs
+++ b/src-core/src/db/yomitan.rs
@@ -2,7 +2,7 @@ use rusqlite::{Result, params};
 use serde::Serialize;
 
 use crate::{
-    CJDicError,
+    CJDicError, Timer,
     db::{Database, yomitan_writer::normalize_term},
 };
 
@@ -35,6 +35,8 @@ impl YomitanDatabase {
         limit: u32,
         offset: u32,
     ) -> Result<Vec<YomitanRow>, CJDicError> {
+        let _timer = Timer::new(format!("search_yomitan: {} {}", q_term, q_reading));
+
         let and_or = if q_term == q_reading { "OR" } else { "AND" };
 
         let mut new_t = String::new();
diff --git a/src-core/src/db/yomitan_writer.rs b/src-core/src/db/yomitan_writer.rs
index 43fe454..c3713af 100644
--- a/src-core/src/db/yomitan_writer.rs
+++ b/src-core/src/db/yomitan_writer.rs
@@ -7,11 +7,10 @@ use std::{
     collections::HashMap,
     io::{Cursor, Read},
     path::{Path, PathBuf},
-    time::Instant,
 };
 use zip::ZipArchive;
 
-use crate::CJDicError;
+use crate::{CJDicError, Timer};
 
 fn blake3_hex(s: &str) -> String {
     format!("{}", hash(s.as_bytes()))
@@ -274,8 +273,8 @@ impl YomitanWriter {
         Callback: Fn(YomitanZipImportProgress),
     {
         let bundle_name = zip_file.file_name();
+        let _timer = Timer::new(format!("Importing {}", bundle_name));
 
-        let start_time = Instant::now();
         self.conn.execute_batch("PRAGMA foreign_keys = off")?;
 
         let cursor = Cursor::new(zip_file.bytes()?);
@@ -593,12 +592,6 @@ impl YomitanWriter {
 
         tx.commit()?;
 
-        println!(
-            "Importing {} takes {:.2?}",
-            zip_file.file_name(),
-            start_time.elapsed()
-        );
-
         self.conn.execute_batch(
             "
             PRAGMA foreign_keys = on;
diff --git a/src-core/src/lib.rs b/src-core/src/lib.rs
index f330686..cb368c1 100644
--- a/src-core/src/lib.rs
+++ b/src-core/src/lib.rs
@@ -1,10 +1,12 @@
 mod db;
 mod error;
 mod service;
+mod util;
 
 pub use db::{YomitanRow, YomitanZipImportProgress, YomitanZipImportResult, ZipSource};
 pub use error::CJDicError;
 pub use service::AppService;
+pub use util::Timer;
 
 pub fn add(left: u64, right: u64) -> u64 {
     left + right
diff --git a/src-core/src/util.rs b/src-core/src/util.rs
new file mode 100644
index 0000000..e596615
--- /dev/null
+++ b/src-core/src/util.rs
@@ -0,0 +1,35 @@
+#[cfg(debug_assertions)]
+use std::time::Instant;
+
+#[cfg(debug_assertions)]
+pub struct Timer {
+    start: Instant,
+    label: String,
+}
+
+#[cfg(debug_assertions)]
+impl Timer {
+    pub fn new(label: String) -> Self {
+        Self {
+            start: Instant::now(),
+            label,
+        }
+    }
+}
+
+#[cfg(debug_assertions)]
+impl Drop for Timer {
+    fn drop(&mut self) {
+        println!("[{}] {:.2?}", self.label, self.start.elapsed())
+    }
+}
+
+#[cfg(not(debug_assertions))]
+pub struct Timer;
+
+#[cfg(not(debug_assertions))]
+impl Timer {
+    pub fn new(_label: String) -> Self {
+        Self
+    }
+}
diff --git a/src-react/src/pages/SearchPage.tsx b/src-react/src/pages/SearchPage.tsx
index 9fc9b04..ce95179 100644
--- a/src-react/src/pages/SearchPage.tsx
+++ b/src-react/src/pages/SearchPage.tsx
@@ -45,6 +45,19 @@ function SearchPage() {
 
   const lang = "ja-JP";
 
+  const isInit = useRef(false);
+  useEffect(() => {
+    if (isInit.current) return;
+    isInit.current = true;
+
+    invoke("search_yomitan", {
+      qTerm: "",
+      qReading: "",
+      limit: 1,
+      offset: 0,
+    });
+  });
+
   useEffect(() => {
     trySearch();
   }, [q]);
@@ -72,6 +85,12 @@ function SearchPage() {
   }
 
   async function runSearch(isNew = true) {
+    let norm_q = q.trim();
+    if (isAutoKana) {
+      norm_q = norm_q.replace(/n$/i, "ん").replace(/[a-z]$/i, "");
+    }
+    if (!norm_q) return;
+
     const ender = /\p{Z}$/u.test(q) ? "" : "*";
 
     const re = /\<(.+?)\>\[(.+?)\]/g;
@@ -79,11 +98,6 @@ function SearchPage() {
     let qTerm = "";
     let qReading = "";
 
-    let norm_q = q.trim();
-    if (isAutoKana) {
-      norm_q = norm_q.replace(/n$/i, "ん").replace(/[a-z]$/i, "");
-    }
-
     norm_q.split(re).map((s, i) => {
       switch (i % 3) {
         case 1: