diff --git a/Build/build-microsoft-cdn.ts b/Build/build-microsoft-cdn.ts
index 2139a1ce..1c2e01b9 100644
--- a/Build/build-microsoft-cdn.ts
+++ b/Build/build-microsoft-cdn.ts
@@ -1,44 +1,57 @@
 import { task } from './trace';
-import { fetchRemoteTextByLine } from './lib/fetch-text-by-line';
-import { HostnameSmolTrie } from './lib/trie';
 import { SHARED_DESCRIPTION } from './constants/description';
 import { createMemoizedPromise } from './lib/memo-promise';
-import { extractDomainsFromFelixDnsmasq } from './lib/parse-dnsmasq';
 import { RulesetOutput } from './lib/rules/ruleset';
-import { appendArrayInPlace } from './lib/append-array-in-place';
+import Worktank from 'worktank';
 
-const PROBE_DOMAINS = ['.microsoft.com', '.windows.net', '.windows.com', '.windowsupdate.com', '.windowssearch.com', '.office.net'];
+const pool = new Worktank({
+  name: 'build-internal-reverse-chn-cidr',
+  size: 1,
+  timeout: 10000, // The maximum number of milliseconds to wait for the result from the worker, if exceeded the worker is terminated and the execution promise rejects
+  warmup: true,
+  autoterminate: 30000, // The interval of milliseconds at which to check if the pool can be automatically terminated, to free up resources, workers will be spawned up again if needed
+  env: {},
+  methods: {
+    // eslint-disable-next-line object-shorthand -- workertank
+    getMicrosoftCdnRuleset: async function (importMetaUrl: string): Promise<[domains: string[], domainSuffixes: string[]]> {
+      // TODO: createRequire is a temporary workaround for https://github.com/nodejs/node/issues/51956
+      const { default: module } = await import('node:module');
+      const __require = module.createRequire(importMetaUrl);
 
-const DOMAINS = [
-  'res.cdn.office.net',
-  'res-1.cdn.office.net',
-  'statics.teams.cdn.office.net'
-];
-const DOMAIN_SUFFIXES = ['download.prss.microsoft.com'];
+      const { HostnameSmolTrie } = __require('./lib/trie');
+      const { PROBE_DOMAINS, DOMAINS, DOMAIN_SUFFIXES, BLACKLIST } = __require('./constants/microsoft-cdn') as typeof import('./constants/microsoft-cdn');
+      const { fetchRemoteTextByLine } = __require('./lib/fetch-text-by-line') as typeof import('./lib/fetch-text-by-line');
+      const { appendArrayInPlace } = __require('./lib/append-array-in-place') as typeof import('./lib/append-array-in-place');
+      const { extractDomainsFromFelixDnsmasq } = __require('./lib/parse-dnsmasq') as typeof import('./lib/parse-dnsmasq');
 
-const BLACKLIST = [
-  'www.microsoft.com',
-  'windowsupdate.com'
-];
+      const trie = new HostnameSmolTrie();
 
-export const getMicrosoftCdnRulesetPromise = createMemoizedPromise<[domains: string[], domainSuffixes: string[]]>(async () => {
-  // First trie is to find the microsoft domains that matches probe domains
-  const trie = new HostnameSmolTrie();
+      for await (const line of await fetchRemoteTextByLine('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/accelerated-domains.china.conf')) {
+        const domain = extractDomainsFromFelixDnsmasq(line);
+        if (domain) {
+          trie.add(domain);
+        }
+      }
 
-  for await (const line of await fetchRemoteTextByLine('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/accelerated-domains.china.conf')) {
-    const domain = extractDomainsFromFelixDnsmasq(line);
-    if (domain) {
-      trie.add(domain);
+      // remove blacklist domain from trie, to prevent them from being included in the later dump
+      BLACKLIST.forEach(black => trie.whitelist(black));
+
+      const domains: string[] = DOMAINS;
+      const domainSuffixes = appendArrayInPlace(PROBE_DOMAINS.flatMap(domain => trie.find(domain)), DOMAIN_SUFFIXES);
+
+      return [domains, domainSuffixes] as const;
     }
   }
+});
 
-  // remove blacklist domain from trie, to prevent them from being included in the later dump
-  BLACKLIST.forEach(black => trie.whitelist(black));
+export const getMicrosoftCdnRulesetPromise = createMemoizedPromise<[domains: string[], domainSuffixes: string[]]>(async () => {
+  const res = await pool.exec(
+    'getMicrosoftCdnRuleset',
+    [import.meta.url]
+  );
+  pool.terminate();
 
-  const domains: string[] = DOMAINS;
-  const domainSuffixes = appendArrayInPlace(PROBE_DOMAINS.flatMap(domain => trie.find(domain)), DOMAIN_SUFFIXES);
-
-  return [domains, domainSuffixes] as const;
+  return res;
 });
 
 export const buildMicrosoftCdn = task(require.main === module, __filename)(async (span) => {
diff --git a/Build/constants/microsoft-cdn.ts b/Build/constants/microsoft-cdn.ts
new file mode 100644
index 00000000..4a414b49
--- /dev/null
+++ b/Build/constants/microsoft-cdn.ts
@@ -0,0 +1,14 @@
+export const PROBE_DOMAINS = ['.microsoft.com', '.windows.net', '.windows.com', '.windowsupdate.com', '.windowssearch.com', '.office.net'];
+
+export const DOMAINS = [
+  'res.cdn.office.net',
+  'res-1.cdn.office.net',
+  'statics.teams.cdn.office.net'
+];
+
+export const DOMAIN_SUFFIXES = ['download.prss.microsoft.com'];
+
+export const BLACKLIST = [
+  'www.microsoft.com',
+  'windowsupdate.com'
+];