Is it a CPU bottleneck (cores being at 100% would be a good sign of this), or memory running low and causing swapfile use (high HDD activity)? Without any further info I'm leaning toward the latter, as you have both a Java application and a browser possibly running lots of JavaScript, and both being GC'd languages means they'll be competing for memory rather aggressively.
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Is it a CPU bottleneck (cores being at 100% would be a good sign of this), or memory running low and causing swapfile use (high HDD activity)? Without any further info I'm leaning toward the latter, as you have both a Java application and a browser possibly running lots of JavaScript, and both being GC'd languages means they'll be competing for memory rather aggressively.
I never bothered to check, but I think it's probably memory. Sorry for the delay to reply, I'm on vacations!