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The memory for canvas buffer memory is limited to 25% of the RAM of the device. However, we have optimized memory consumption in CanvasJS v2.3.1 and v3.6. Kindly download the latest version of CanvasJS Charts from our download page.
To optimize the performance further, you can try lazy loading the charts. We have tested the same using jquery.inview & it seems to perform better compared to the regular way of rendering charts / stockcharts.
Please check this JSFiddle for a working example.