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Dumps don't show up any particular issues. By hanging, do you mean that the IDE is locked and has to be killed, or just slows down for a few seconds? please try taking CPU snapshots once the problem occurs - see https://intellij-support.jetbrains.com/hc/en-us/articles/207241235-Reporting-performance-problems for instructions. Also, what does your application look like - frameworks/build tools being used? How big is your project?
I'd suggest excluding all folders dynamically generated by build tools from your project (Mark directory as/Excluded). Other directories you don't need to get completion from (auxiliary node_modules, bower_components, etc.) can be excluded as well.

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