dataset performance for large data

[fxxjdedd]

Version

4.5.0

Reproduction link

https://codepen.io/fxxjdedd/pen/OJPgvxZ?editors=1111

Steps to reproduce

分别使用option和optionUsingDataset这两个配置进行setOption

What is expected?

不应该有非常大的性能差距

What is actually happening?

在series超过一定数量（大概100个）后，dataset性能会越来越差，甚至会直接崩溃。

---

1. 希望能优化legend.selected，对于隐藏的系列不要参与到首次渲染之中 #11806 会跟这条issue有一定的关系
2. 尝试在我的代码里手动把dataset转成original的数据形式，发现性能提升明显，猜测是echarts内部代码问题
3. 如果dataset的确有性能问题，应该在文档里加以描述

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[100pah]

The genName in completeDimensions.js needs to be optimized.

Potential optimization:

• Do not use loop but remember the current number.
• Use plain object rather than the hashMap (not sure)