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  1. #1
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    Default ExtJS 4 charts performance

    ExtJS 4 charts performance


    Hi,

    The performance of the charts in ExtJS 4.0 seems to be very low. For instance, in line charts there is a significant delay in drawing the points and animation even for 100 points or less.
    I have seen mobile charting frameworks that are more responsive for such a reduced number of points.

    Also, desktop charting packages become that unresponsive at 10000+ points.

    Regards,

    Dan

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    We are having the same issues. We are even thinking of switching to flash charts. Can anyone provide any tips or workarounds for increasing chart performance.

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    See my post and example in this thread:

    http://www.sencha.com/forum/showthread.php?246360

    I think there are two reasons for low chart performance: (1) overhead of the data package and (2) the drawing package (on which the Ext JS charts are based) is not efficient.

    Regarding point #2, there have been some improvements in the Touch drawing package, so these changes might land in Ext JS as well in a future release.

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    I noticed the biggest slow down is happening in the (drawVerticalLabels and drawHorizontalLabels), it takes about 50% of the time to process the graphs. Also, in Sencha Touch these functions dont exist, they use something different for drawing labels.

    I'm trying to optimize these functions a bit however so far I havent seen too much gain.

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