Okay, that is great so the bug is mainly on the browser side. I fear that it is by design to refresh on updated items. I had similar but way smaller problems on my raspberry pi with my smart meter, I got so much data that it could not keep up anymore, but it did not come to this breaking point.
What you could maybe do is linking statically to the chart or switching to another charting solution like InfluxDB+Grafana persistence and graphing
@rlkoshak do you have any other suggestions.