@rose,
In JavaScript, Array length can go upto 2^32−1 as mentioned in the ECMA documentation. CanvasJS can easily render a large number of dataPoints without any issue. Please check this performance test page for an example with 50000 dataPoints.
Can you please create and share a JSFiddle reproducing the issue so that we can look into the code, understand the scenario better and help you out.
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Indranil Deo
Team CanvasJS