menu菜单组件递归后(层级大于2级时)，切换菜单时，一级菜单选中肉眼可见的卡顿甚至延迟

[yunlongduan]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

2.0.0-rc.2

Environment

win10 20H2、Microsoft Edge( 86.0.622.48 (64 位))、 "vue": "^3.0.3",

Reproduction link

https://github.com/yunlongduan/test

Steps to reproduce

menu菜单组件递归后(层级大于2级时)，切换菜单时，一级菜单选中肉眼可见的卡顿甚至延迟

What is expected?

不卡顿不延迟

What is actually happening?

menu菜单组件递归后(层级大于2级时)，切换菜单时，一级菜单选中肉眼可见的卡顿甚至延迟

[tangjinzhou]

确认是 rc.2 ？

[yunlongduan]

示例版本是beta版本，这个版本递归出现首次菜单无法选中，而后我升级rc.2版本后，发现切换菜单时，不管是展开还是选中都会出现延迟，示例中版本没来的及更新，实在是不好意思，但问题在确实存在的。

[ghost]

@tangjinzhou I also have this problem. The version is 2.0.0-rc2, which compares the menu of the React version with the menu of the element. The ant-design-vue menu is much slower than these two frameworks

[ghost]

@tangjinzhou

Most of the reasons for the card discovery are due to this reason:

When the mouse moves to the menu, as long as the mouse moves, the entire menu will be re-rendered, including all the internal menu items. Such repetition caused a lot of dom element updates, resulting in card changes

[tangjinzhou]

@yunlongduan 你这个示例不卡啊
@anncwb rc.3 also slow ?

[anncwb]

@tangjinzhou 折叠在菜单多的时候还是会有点卡顿，但是比rc1好了很多。 刚刚试了下 鼠标移动上去确实会触发menuitem的渲染

[yunlongduan]

@tangjinzhou 上面这个示例版本还没来的及更新，实际开发中把版本更新到rc.2以及数据多放点就会出现。

[Ttou]

我这边试了下，子菜单展开的时候动画正常，收缩的时候没有动画了

[L-orz]

我这边试了下，子菜单展开的时候动画正常，收缩的时候没有动画了

@tangjinzhou
我这边同样也是收缩没有动画。
还有另一个问题：
使用openKeys和selectKeys，样式更改滞后于数据修改。（比如item-1被取消选中，但是item-1还是具有active的class，此时需要光标移动至item-1，acitve才会被取消)

[zkwolf]

@xiaoLus 收缩没动画的话试试把vue退回3.0.3

[Ttou]

@zkwolf 试了下，Vue 3.0.3 收缩动画是正常的

[zkwolf]

嗯，已知bug，等vue发下个版本吧

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[github-actions]

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