@shaimaaashrafgmail-com,
Earlier WebKit allowed 448MB of canvas buffer memory whereas now they have dropped it to 224MB. Because of this, there was some memory issue with CanvasJS Charts in the latest iOS. However, we have optimized memory consumption in CanvasJS v2.3 – please check out this release blog for more info. Also, we will consider to improve it further in the future releases.
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Manoj Mohan
Team CanvasJS