diff --git a/public/preload.js b/public/preload.js
index c2d7f79..2beadc3 100644
--- a/public/preload.js
+++ b/public/preload.js
@@ -7,6 +7,7 @@
 const fs = require('fs')
 const crypto = require('crypto')
 const { clipboard } = require('electron')
+const time = require('./time')
 
 const homePath = utools.getPath('home')
 const userDataPath = utools.getPath('userData')
@@ -17,7 +18,6 @@ const isWindows = utools.isWindows()
 const DBPath = `${isMacOs ? userDataPath : homePath}${isWindows ? '\\' : '/'}${dbName}`
 
 let globalImageOversize = false
-let globalTimmerSet = false
 
 class DB {
   constructor(path) {
@@ -119,46 +119,46 @@ class DB {
   }
 }
 
-const pbpaste = async () => {
-  return new Promise((res) => {
-    // file
-    const files = utools.getCopyedFiles() // null | Array
-    if (files) {
-      res({
-        type: 'file',
-        data: JSON.stringify(files)
-      })
+const pbpaste = () => {
+  // file
+  const files = utools.getCopyedFiles() // null | Array
+  if (files) {
+    return {
+      type: 'file',
+      data: JSON.stringify(files)
     }
-    // text
-    const text = clipboard.readText()
-    if (text.trim()) res({ type: 'text', data: text })
-    // image
-    const image = clipboard.readImage() // 大图卡顿来源
-    const data = image.toDataURL()
-    globalImageOversize = data.length > 4e5
-    if (!image.isEmpty()) {
-      res({
-        type: 'image',
-        data: data
-      })
+  }
+  // text
+  const text = clipboard.readText()
+  if (text.trim()) return { type: 'text', data: text }
+  // image
+  const image = clipboard.readImage() // 大图卡顿来源
+  const data = image.toDataURL()
+  globalImageOversize = data.length > 4e5
+  if (!image.isEmpty()) {
+    return {
+      type: 'image',
+      data: data
     }
-  })
+  }
 }
 
 const watchClipboard = async (db, fn) => {
   let prev = db.dataBase.data[0] || {}
-  return setInterval(() => {
-    pbpaste().then((item) => {
-      item.id = crypto.createHash('md5').update(item.data).digest('hex')
-      if (item && prev.id != item.id) {
-        // 剪切板元素 与最近一次复制内容不同
-        prev = item
-        fn(item)
-      } else {
-        // 剪切板元素 与上次复制内容相同
-      }
-    })
-  }, 250)
+  function loop() {
+    time.sleep(250).then(loop)
+    const item = pbpaste()
+    if (!item) return
+    item.id = crypto.createHash('md5').update(item.data).digest('hex')
+    if (item && prev.id != item.id) {
+      // 剪切板元素 与最近一次复制内容不同
+      prev = item
+      fn(item)
+    } else {
+      // 剪切板元素 与上次复制内容相同
+    }
+  }
+  loop()
 }
 
 const copy = (item, isHideMainWindow = true) => {
@@ -210,39 +210,17 @@ let timmer = watchClipboard(db, (item) => {
   db.addItem(item)
 })
 
-globalTimmerSet = true // 计时器成功添加
-
 utools.onPluginEnter(() => {
   if (globalImageOversize) {
     utools.copyText('ImageOverSized')
     globalImageOversize = false
   }
-  if (!globalTimmerSet) {
-    // 定时器被清除了 重新添加计时器
-    // same to code above
-    timmer = watchClipboard(db, (item) => {
-      if (!item) return
-      if (db.updateItemViaId(item.id)) {
-        return
-      }
-      item.createTime = new Date().getTime()
-      item.updateTime = new Date().getTime()
-      db.addItem(item)
-    })
-  }
   focus()
   select() // 进入插件将搜索框内容全选
   toTop()
   resetNav()
 })
 
-utools.onPluginOut((processExit) => {
-  // 卡顿来源: 似乎插件每次启动 uTools不会清除插件设置的 interval定时器
-  // 插件重复进入/退出会产生多个计时器导致插件卡退
-  // 插件退出 清除计时器 插件隐藏后台 不清除
-  processExit ? (clearInterval(timmer), (globalTimmerSet = false)) : (globalTimmerSet = true)
-})
-
 window.db = db
 window.copy = copy
 window.paste = paste
diff --git a/public/time.js b/public/time.js
new file mode 100644
index 0000000..05079ef
--- /dev/null
+++ b/public/time.js
@@ -0,0 +1,68 @@
+// author: inu1255
+
+const path = require('path')
+
+function newPromise(fn) {
+  let a, b
+  var tmp = {
+    resolve(x) {
+      if (this.pending) {
+        a(x)
+        this.resolved = true
+        this.pending = false
+      }
+    },
+    reject(e) {
+      if (this.pending) {
+        b(e)
+        this.rejectd = true
+        this.pending = false
+      }
+    },
+    pending: true,
+    resolved: false,
+    rejected: false
+  }
+  /** @type {Promise<T>} */
+  var pms = new Promise(function (resolve, reject) {
+    a = resolve
+    b = reject
+    if (fn) fn(tmp.resolve, tmp.reject)
+  })
+  return Object.assign(pms, tmp)
+}
+
+let cbIdx = 1
+const cbMap = new Map()
+function getWorker() {
+  if (getWorker.worker) return getWorker.worker
+  const worker = new Worker(path.join(__dirname, 'time.worker.js'))
+  getWorker.worker = worker
+  worker.onmessage = (e) => {
+    if (e.data && cbMap.has(e.data.cb)) {
+      cbMap.get(e.data.cb).apply(null, e.data.args)
+    }
+  }
+  return worker
+}
+
+function call(method, args) {
+  const cb = cbIdx++
+  let pms = newPromise()
+  cbMap.set(cb, function (err, data) {
+    if (err) pms.reject(err)
+    else pms.resolve(data)
+  })
+  getWorker().postMessage({
+    method,
+    args,
+    cb
+  })
+  return pms
+}
+
+function sleep(ms) {
+  return call('sleep', [ms])
+}
+
+exports.sleep = sleep
diff --git a/public/time.worker.js b/public/time.worker.js
new file mode 100644
index 0000000..d62d14e
--- /dev/null
+++ b/public/time.worker.js
@@ -0,0 +1,21 @@
+// author: inu1255
+
+const apis = {
+  sleep(ms) {
+    return new Promise((resolve) => setTimeout(resolve, ms))
+  }
+}
+
+onmessage = (event) => {
+  const data = event.data
+  if (!data) return
+  const { cb, method, args } = data
+  if (!apis[method]) {
+    postMessage({ cb, err: 'no such method' })
+    return
+  }
+  apis[method].apply(null, args).then(
+    (res) => postMessage({ cb, data: res }),
+    (err) => postMessage({ cb, err })
+  )
+}