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As a suggestion, check the wmode setting on the charts. If possible leave it unset or use wmode="opaque". Using wmode="transparent" eats up significant amounts of client memory and can bring a browser to a halt if you are running even a few charts concurrently.

You shouldn't need a live link to investigate this problem. Using real-time charts, updating every few seconds or so and memory usage slowly increases over time. That's with 15 data points and a single chart. If you need a live link go look at the FusionWidgets example provide here: http://www.fusioncharts.com/widgets/Demos/RealTimeJS/Index.html Open that screen in a browser and let it run for several hours; memory use slowly grows. Open multiple tabs to that example and memory use grows faster over time.