Next, open webstorm.vmoptions and bump up the max heap size to at least 3 gigabytes. Our dev machines have so much memory — might as well use it!
Make WebStorm better with these customizations
Victor Savkin
21012

Can you add screenshot? 
-Xms128m
-Xmx750m
-XX:ReservedCodeCacheSize=240m
-XX:+UseCompressedOops

These are the default settings;

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