[GitHub] [echarts] JinJianQi commented on issue #17641: [Bug] setOption took a long time. And block UI process.

[GitBox]

JinJianQi commented on issue #17641:
URL: https://github.com/apache/echarts/issues/17641#issuecomment-1255983079

   @Ovilia Hi~
   
   I find that when the value have a big object, the setOption will take longer 
time.
   
   This is an Online demo to reproduce.
   
   https://codesandbox.io/s/confident-shockley-2t1e7n?file=/src/index.js
   
   <img width="1440" alt="image" 
src="https://user-images.githubusercontent.com/33452468/191929464-e525138c-a553-4e2c-bf4c-13c15e7715b2.png";>
   
   There is about 1000 x 50 values. And each item has a large `rawData`(it's a 
json object).
   
   Something like this:
   
   ```
   {
   itemStyle: {},
   value: [0, 10, 20, {...bigObject}]
   }
   ```
   
   Through the Performance tab of ChromeDevTool, I find the `clone` method of 
setOption take a long time. Like this:
   
   <img width="1440" alt="image" 
src="https://user-images.githubusercontent.com/33452468/191930306-2cb7f71d-9326-41a4-a5d2-4e0b8dc28d32.png";>
   
   I think there must be some deepClone processes? Is there any way not to 
clone ?
   
   
   
   
   
   


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