重现代码片段：

https://developers.weixin.qq.com/s/tqmZCBm17PkE

页面渲染很慢，有很多这样的log

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38392, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38505, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38580, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38674, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38768, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38862, …}

appservice.js:1485 right res {id: "", dataset: {…}, left: 0, right: 320, top: 38956, …}

...

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]

appservice.js:1485 btn rects [{…}]