nz-tree 加载大数据时页面卡顿，影响操作体验

[pengmz-benqio]

Reproduction link

https://stackblitz.com/edit/ng-zorro-antd-start-1qgquv?file=src/app/app.component.ts

Steps to reproduce

点击展开节点，或者选择chekbox

What is expected?

大量数据加载后渲染速度可以在秒级

What is actually happening?

页面卡顿好几秒才有响应，节点越多，耗时越久

Environment	Info
ng-zorro-antd	7.0.0
Browser	chrome75

---

是否可以增加参数限制一些不必要的递归操作，或者其他可以优化速度的逻辑

[zorro-bot]

Translation of this issue:

nz-tree page Caton when loading large data, operator experience

Reproduction link

[Https://stackblitz.com/edit/ng-zorro-antd-start-1qgquv?file=src/app/app.component.ts](https://stackblitz.com/edit/ng-zorro-antd- start-1qgquv? file = src / app / app.component.ts)

Steps to reproduce

Click to expand the node, or select chekbox

What is expected?

After loading a large amount of data can be rendered at the second speed stage

What is actually happening?

Caton seconds have good page response, the more nodes, the longer the time-consuming

Environment	Info
Ng-zorro-antd	7.0.0
Browser	chrome75

---

Parameter limits may be increased if the number of unnecessary recursive operations, or other logic can be optimized speed