kbrix2000 commented on issue #21564:
URL: https://github.com/apache/echarts/issues/21564#issuecomment-4311117209

   Yes, I can confirm the problem, too.
   
   @helgasoft Thanks for the hint, but unfortunately setting 
`filterMode:'none'` does not fix the problem: It improves the graphics but at 
the same time the y-axis is scaled to the full data set instead of to the 
visible part only. And, more importantly, the performance is significantly 
reduced for large data sets, which is not sustainable.
   
   As far as I understand the filter selects all visible points in the data 
set. But in general, this is not enough. For lines, we need one additional 
point beyond the boundary in order to display the function correctly, for 
splines it could be a few additional points. Do you agree?
   


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