pissang commented on issue #14875:
URL: https://github.com/apache/echarts/issues/14875#issuecomment-833301070


   @plainheart 
   
   `zr_100000` is a special `zlevel` that provided to the hover layer.
   
   SVG rendering mode is not good at animation performance because each frame 
it will manipulate the attributes of DOM. Even if we did lots of optimizations, 
it's still not as fast as Canvas. Especially in a case like this map which has 
lots of elements. The advance of SVG rendering mode is reducing the memory 
usage on mobile devices.


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