High CPU usage in Eclipse when idle

Question

On my multicore machine, Eclipse uses between 100 and 250 % CPU power, even when idling on a new plain install and an empty workspace. When actually doing things, it becomes slo

Answer 1

Uninstalling mylyn plugins fixed the issue for me and the performance boost was so drastic that I am posting it as answer to a 6 year old question.

Go to Help->About Eclipse->Installation Details->Installed Software and uninstall all plugins that you know you are not using. I uninstalled only mylyn plugins and it did the wonder for me.

EDIT:

In the eclipse version : 2018-09 (4.9.0), the eclipse freeze/unresponsive issue can be solved by - closing the package & project explorer.

I know this may sound like a dumb solution, but I have tested this on about 5 peer machines, multiple times and believe me when I say this simple solution removed the freeze issue in each of them. As long as package/project explorer was not reopened, none of them complained about unresponsive eclipse.