helgasoft commented on issue #20739:
URL: https://github.com/apache/echarts/issues/20739#issuecomment-2646611682

   > reduce the number of refreshes e.g. once every 500 milliseconds (i.e. when 
50 datapoints have been appended). 
   
   This is possible, but there may be a bug for ```type='line'```. Type 
'scatter' works as expected though - 
[Demo](https://echarts.apache.org/examples/en/editor.html?c=line-simple&code=PYBwLglsB2AEC8sDeBYAULWBDaEC2WkMAXAGZYA2AzgKYA06mAHgIJMRXHKOaxgCeIGlwBEkPDREMMvACaEsXANoBdHgF9pmfmw5cksTT1oAnCDU6wlPTKhm9Y8sIqsqtDvoOGwRFCNEl3BwEhUSoAY0IwGhMpTAB6eNhw4DwJaDBYYABXTNJgE08heAByPwCSm0MeNTR1AG50dBTsjIQABka0RNgWECFoWVgARnaxxwVYEGB_MCpYAHcIMAALEfbYPFpw2FmYgDdKdEPCvZNDigRYWjAASQyDygAKJ4BKBAA-bhkellkhrDXfwAcwoNAmzmmsz4K0IsHyFAowAW80BVH84IWWH2NB4KWgVEy0GRVwAIoQaAA6YkLN5dTD4wmwAILcnOK5KJQ0uiwACyhBWlPR0CeLTaACo-QLKQAFW6wJKjdrvSUAVg2AGpYOrYCoVPTNvwAMKwkxgSlYfo0QZsrBPOwOUzmKj3WQ0JhcdpBCEuFm2jSvLp4nIZDUag0QUiwF5izIAUm1yoQ8CTeGNpvNJgsEAAXjQ6bwejQcSZ-InVjxI9HY7APoglUnwmCsCZ7tFzs8zhdA-hNOtA0A).
   See also my Demo in related #18742, it does not use _appendData_ and looks 
smooth.


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