diff --git a/Build/build-anti-bogus-domain.js b/Build/build-anti-bogus-domain.js
index 90577070..533d043d 100644
--- a/Build/build-anti-bogus-domain.js
+++ b/Build/build-anti-bogus-domain.js
@@ -10,11 +10,9 @@ const { minifyRules } = require('./lib/minify-rules');
   console.time('Total Time - build-anti-bogus-domain');
   console.time('* Download bogus-nxdomain-list');
 
-  const rl = await fetchRemoteTextAndCreateReadlineInterface('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/bogus-nxdomain.china.conf');
-
   /** @type {string[]} */
   const res = [];
-  for await (const line of rl) {
+  for await (const line of await fetchRemoteTextAndCreateReadlineInterface('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/bogus-nxdomain.china.conf')) {
     if (line.startsWith('bogus-nxdomain=')) {
       res.push(line.replace('bogus-nxdomain=', ''));
     }
diff --git a/Build/build-cdn-conf.js b/Build/build-cdn-conf.js
index 88153427..ad9f201e 100644
--- a/Build/build-cdn-conf.js
+++ b/Build/build-cdn-conf.js
@@ -40,22 +40,6 @@ const Trie = require('./lib/trie');
     }
   }
 
-  await compareAndWriteFile(
-    withBannerArray(
-      'Sukka\'s Surge Rules - CDN Domains',
-      [
-        'License: AGPL 3.0',
-        'Homepage: https://ruleset.skk.moe',
-        'GitHub: https://github.com/SukkaW/Surge',
-        '',
-        'This file contains object storage and static assets CDN domains.'
-      ],
-      new Date(),
-      minifyRules(cdnDomainsList)
-    ),
-    path.resolve(__dirname, '../List/non_ip/cdn.conf')
-  );
-
   /**
    * Dedupe cdn.conf
    */
@@ -71,21 +55,38 @@ const Trie = require('./lib/trie');
     }
   }
 
-  await compareAndWriteFile(
-    withBannerArray(
-      'Sukka\'s Surge Rules - CDN Domains',
-      [
-        'License: AGPL 3.0',
-        'Homepage: https://ruleset.skk.moe',
-        'GitHub: https://github.com/SukkaW/Surge',
-        '',
-        'This file contains object storage and static assets CDN domains.'
-      ],
-      new Date(),
-      minifyRules(domainDeduper(Array.from(cdnDomains)))
+  await Promise.all([
+    compareAndWriteFile(
+      withBannerArray(
+        'Sukka\'s Surge Rules - CDN Domains',
+        [
+          'License: AGPL 3.0',
+          'Homepage: https://ruleset.skk.moe',
+          'GitHub: https://github.com/SukkaW/Surge',
+          '',
+          'This file contains object storage and static assets CDN domains.'
+        ],
+        new Date(),
+        minifyRules(cdnDomainsList)
+      ),
+      path.resolve(__dirname, '../List/non_ip/cdn.conf')
     ),
-    path.resolve(__dirname, '../List/domainset/cdn.conf')
-  );
+    compareAndWriteFile(
+      withBannerArray(
+        'Sukka\'s Surge Rules - CDN Domains',
+        [
+          'License: AGPL 3.0',
+          'Homepage: https://ruleset.skk.moe',
+          'GitHub: https://github.com/SukkaW/Surge',
+          '',
+          'This file contains object storage and static assets CDN domains.'
+        ],
+        new Date(),
+        minifyRules(domainDeduper(Array.from(cdnDomains)))
+      ),
+      path.resolve(__dirname, '../List/domainset/cdn.conf')
+    )
+  ]);
 
   console.timeEnd('Total Time - build-cdn-conf');
 })();
diff --git a/Build/build-internal-cdn-rules.js b/Build/build-internal-cdn-rules.js
index a1a93d98..404a6a93 100644
--- a/Build/build-internal-cdn-rules.js
+++ b/Build/build-internal-cdn-rules.js
@@ -62,17 +62,19 @@ const escapeRegExp = (string) => {
     }
   };
 
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/cdn.conf'));
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/global.conf'));
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/global_plus.conf'));
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/my_proxy.conf'));
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/stream.conf'));
-  await processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/telegram.conf'));
+  await Promise.all([
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/cdn.conf')),
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/global.conf')),
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/global_plus.conf')),
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/my_proxy.conf')),
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/stream.conf')),
+    processLocalRuleSet(path.resolve(__dirname, '../List/non_ip/telegram.conf')),
+    processLocalDomainSet(path.resolve(__dirname, '../List/domainset/cdn.conf')),
+    processLocalDomainSet(path.resolve(__dirname, '../List/domainset/download.conf')),
 
-  await processLocalDomainSet(path.resolve(__dirname, '../List/domainset/cdn.conf'));
-  await processLocalDomainSet(path.resolve(__dirname, '../List/domainset/download.conf'));
+    fse.ensureDir(path.resolve(__dirname, '../List/internal'))
+  ]);
 
-  await fse.ensureDir(path.resolve(__dirname, '../List/internal'));
   await fs.promises.writeFile(
     path.resolve(__dirname, '../List/internal/cdn.txt'),
     [
diff --git a/Build/build-internal-chn-domains.js b/Build/build-internal-chn-domains.js
index 88195025..e3622ad5 100644
--- a/Build/build-internal-chn-domains.js
+++ b/Build/build-internal-chn-domains.js
@@ -5,9 +5,11 @@ const fs = require('fs');
 const { parseFelixDnsmasq } = require('./lib/parse-dnsmasq');
 
 (async () => {
-  const result = await parseFelixDnsmasq('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/accelerated-domains.china.conf');
+  const [result] = await Promise.all([
+    parseFelixDnsmasq('https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/accelerated-domains.china.conf'),
+    fse.ensureDir(path.resolve(__dirname, '../List/internal'))
+  ]);
 
-  await fse.ensureDir(path.resolve(__dirname, '../List/internal'));
   await fs.promises.writeFile(
     path.resolve(__dirname, '../List/internal/accelerated-china-domains.txt'),
     `${result.map(line => `SUFFIX,${line}`).join('\n')}\n`
diff --git a/Build/build-reject-domainset.js b/Build/build-reject-domainset.js
index 65742b0f..c823db2d 100644
--- a/Build/build-reject-domainset.js
+++ b/Build/build-reject-domainset.js
@@ -106,9 +106,7 @@ const domainSuffixSet = new Set();
   let previousSize = domainSets.size;
   console.log(`Import ${previousSize} rules from Hosts / AdBlock Filter Rules!`);
 
-  const rl1 = readFileByLine(pathResolve(__dirname, '../Source/domainset/reject_sukka.conf'));
-
-  for await (const line of rl1) {
+  for await (const line of readFileByLine(pathResolve(__dirname, '../Source/domainset/reject_sukka.conf'))) {
     const l = processLine(line);
     if (l) {
       domainSets.add(l);
@@ -118,8 +116,7 @@ const domainSuffixSet = new Set();
   previousSize = domainSets.size - previousSize;
   console.log(`Import ${previousSize} rules from reject_sukka.conf!`);
 
-  const rl2 = readFileByLine(pathResolve(__dirname, '../List/non_ip/reject.conf'));
-  for await (const line of rl2) {
+  for await (const line of readFileByLine(pathResolve(__dirname, '../List/non_ip/reject.conf'))) {
     if (line.startsWith('DOMAIN-KEYWORD')) {
       const [, ...keywords] = line.split(',');
       domainKeywordsSet.add(keywords.join(',').trim());
@@ -129,8 +126,7 @@ const domainSuffixSet = new Set();
     }
   }
 
-  const rl3 = readFileByLine(pathResolve(__dirname, '../List/domainset/reject_phishing.conf'));
-  for await (const line of rl3) {
+  for await (const line of readFileByLine(pathResolve(__dirname, '../List/domainset/reject_phishing.conf'))) {
     const l = processLine(line);
     if (l && l[0] === '.') {
       domainSuffixSet.add(l.slice(1));
@@ -216,42 +212,42 @@ const domainSuffixSet = new Set();
     .sort(sorter)
     .map((i) => i.v);
 
-  await compareAndWriteFile(
-    withBannerArray(
-      'Sukka\'s Surge Rules - Reject Base',
-      [
-        'License: AGPL 3.0',
-        'Homepage: https://ruleset.skk.moe',
-        'GitHub: https://github.com/SukkaW/Surge',
-        '',
-        'The domainset supports AD blocking, tracking protection, privacy protection, anti-phishing, anti-mining',
-        '',
-        'Build from:',
-        ...HOSTS.map(host => ` - ${host[0]}`),
-        ...ADGUARD_FILTERS.map(filter => ` - ${Array.isArray(filter) ? filter[0] : filter}`)
-      ],
-      new Date(),
-      sortedDomainSets
+  await Promise.all([
+    compareAndWriteFile(
+      withBannerArray(
+        'Sukka\'s Surge Rules - Reject Base',
+        [
+          'License: AGPL 3.0',
+          'Homepage: https://ruleset.skk.moe',
+          'GitHub: https://github.com/SukkaW/Surge',
+          '',
+          'The domainset supports AD blocking, tracking protection, privacy protection, anti-phishing, anti-mining',
+          '',
+          'Build from:',
+          ...HOSTS.map(host => ` - ${host[0]}`),
+          ...ADGUARD_FILTERS.map(filter => ` - ${Array.isArray(filter) ? filter[0] : filter}`)
+        ],
+        new Date(),
+        sortedDomainSets
+      ),
+      pathResolve(__dirname, '../List/domainset/reject.conf')
     ),
-    pathResolve(__dirname, '../List/domainset/reject.conf')
-  );
-
-  await fs.promises.writeFile(
-    pathResolve(__dirname, '../List/internal/reject-stats.txt'),
-    Object.entries(rejectDomainsStats)
-      .sort((a, b) => {
-        const t = b[1] - a[1];
-        if (t === 0) {
-          return a[0].localeCompare(b[0]);
-        }
-        return t;
-      })
-      .map(([domain, count]) => `${domain}${' '.repeat(100 - domain.length)}${count}`)
-      .join('\n')
-  );
-
-  // Copy reject_sukka.conf for backward compatibility
-  await fse.copy(pathResolve(__dirname, '../Source/domainset/reject_sukka.conf'), pathResolve(__dirname, '../List/domainset/reject_sukka.conf'));
+    fs.promises.writeFile(
+      pathResolve(__dirname, '../List/internal/reject-stats.txt'),
+      Object.entries(rejectDomainsStats)
+        .sort((a, b) => {
+          const t = b[1] - a[1];
+          if (t === 0) {
+            return a[0].localeCompare(b[0]);
+          }
+          return t;
+        })
+        .map(([domain, count]) => `${domain}${' '.repeat(100 - domain.length)}${count}`)
+        .join('\n')
+    ),
+    // Copy reject_sukka.conf for backward compatibility
+    fse.copy(pathResolve(__dirname, '../Source/domainset/reject_sukka.conf'), pathResolve(__dirname, '../List/domainset/reject_sukka.conf'))
+  ]);
 
   console.timeEnd('* Write reject.conf');
 
diff --git a/Build/download-previous-build.js b/Build/download-previous-build.js
index aa7bcac8..0a9024d8 100644
--- a/Build/download-previous-build.js
+++ b/Build/download-previous-build.js
@@ -33,9 +33,12 @@ const fileExists = (path) => {
   }
 
   const extractedPath = join(tmpdir(), `sukka-surge-last-build-extracted-${Date.now()}`);
-  await fse.ensureDir(extractedPath);
 
-  const resp = await fetch('https://codeload.github.com/sukkaw/surge/tar.gz/gh-pages');
+  const [resp] = await Promise.all([
+    fetch('https://codeload.github.com/sukkaw/surge/tar.gz/gh-pages'),
+    fse.ensureDir(extractedPath)
+  ]);
+
   await pipeline(
     Readable.fromWeb(resp.body),
     tar.x({
diff --git a/Build/lib/parse-filter.js b/Build/lib/parse-filter.js
index b45db11c..787adf9d 100644
--- a/Build/lib/parse-filter.js
+++ b/Build/lib/parse-filter.js
@@ -29,9 +29,7 @@ async function processDomainLists(domainListsUrl) {
   /** @type Set<string> */
   const domainSets = new Set();
 
-  const rl = await fetchRemoteTextAndCreateReadlineInterface(domainListsUrl);
-
-  for await (const line of rl) {
+  for await (const line of await fetchRemoteTextAndCreateReadlineInterface(domainListsUrl)) {
     if (line.startsWith('!')) {
       continue;
     }
@@ -65,9 +63,8 @@ async function processHosts(hostsUrl, includeAllSubDomain = false) {
   /** @type Set<string> */
   const domainSets = new Set();
 
-  const rl = await fetchRemoteTextAndCreateReadlineInterface(hostsUrl);
-  for await (const _line of rl) {
-    const line = processLine(_line);
+  for await (const l of await fetchRemoteTextAndCreateReadlineInterface(hostsUrl)) {
+    const line = processLine(l);
     if (!line) {
       continue;
     }
diff --git a/Build/lib/string-array-compare.js b/Build/lib/string-array-compare.js
index 4907d1ad..17983dcc 100644
--- a/Build/lib/string-array-compare.js
+++ b/Build/lib/string-array-compare.js
@@ -10,12 +10,10 @@ const { readFileByLine } = require('./fetch-remote-text-by-line');
 async function compareAndWriteFile(linesA, filePath) {
   await fse.ensureFile(filePath);
 
-  const rl = readFileByLine(filePath);
-
   let isEqual = true;
   let index = 0;
 
-  for await (const lineB of rl) {
+  for await (const lineB of readFileByLine(filePath)) {
     const lineA = linesA[index];
     index++;
 
diff --git a/Build/validate-domainset.js b/Build/validate-domainset.js
index 0180093d..45f8188f 100644
--- a/Build/validate-domainset.js
+++ b/Build/validate-domainset.js
@@ -14,11 +14,7 @@ const SPECIAL_SUFFIXES = new Set([
 ]);
 
 const validateDomainSet = async (filePath) => {
-  const rl = readFileByLine(
-    path.resolve(__dirname, '../List/domainset', filePath)
-  );
-
-  for await (const l of rl) {
+  for await (const l of readFileByLine(path.resolve(__dirname, '../List/domainset', filePath))) {
     // starts with #
     const line = processLine(l);
     if (!line) {
@@ -38,14 +34,10 @@ const validateDomainSet = async (filePath) => {
   }
 };
 
-const validateRuleset = async (filePath) => {
-  const rl = readFileByLine(
-    path.resolve(__dirname, '../List/non_ip', filePath)
-  );
-
+const _validateRuleset = async (filePath) => {
   console.log(`[${filePath}]`);
 
-  for await (const l of rl) {
+  for await (const l of readFileByLine(path.resolve(__dirname, '../List/non_ip', filePath))) {
     // starts with #
     const line = processLine(l);
     if (!line) {