[Bug Report] Table组件在启用固定列时，鼠标滑动高亮卡顿严重
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- Dominant language
- Vue
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Description
### Element UI version
2.15.12
### OS/Browsers version
edge
### Vue version
2.7.14
### Reproduction Link
https://element.eleme.cn/#/zh-CN/component/table
### Steps to reproduce
https://element.eleme.cn/#/zh-CN/component/table
官网文档中固定列demo即可重现。
### What is Expected?
无
### What is actually happening?
无
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Assessment
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