refactor: 测速默认频率调到120秒

packages/core/src/config/index.js

@@ -240,7 +240,7 @@ module.exports = {
       },
       speedTest: {
         enabled: true,
-        interval: 300000,
+        interval: 120000,
         hostnameList: ['github.com'],
         dnsProviders: ['usa', 'quad9', 'rubyfish']
       }

packages/mitmproxy/src/lib/speed/SpeedTester.js

@@ -81,7 +81,7 @@ class SpeedTester {
   }
 
   async test () {
-    if (this.testCount % 10 === 0 || this.backupList.length === 0) {
+    if (this.testCount % 10 <= 3 || this.backupList.length === 0) {
       const newList = await this.getIpListFromDns(this.dnsMap)
       const newBackupList = [...newList, ...this.backupList]
       this.backupList = _.unionBy(newBackupList, 'host')