Just a short post, maybe it will help someone. Lately, while working on a big PHP project, I was experiencing a problem with CPU usage. After some time of coding eclipse was using all four CPU cores, which resulted in general system slowness and quick eating my laptop battery.
I was chasing this problem for a few days, doing some random stuff (detaching the project from SVN, disabling syntax highlighting, code completion and syntax validation). Neither of this worked. But I was able to narrow down the problem: the CPU usage was going up as I was opening JavaScript files. After some times of trying bunch of different solutions I found it.
When creating my PHP project, I checked the JavaScript support option. I thought that as we use quite a lot of JavaScript, this maybe useful (whatever it does). After disabling this option, my problem were gone. After a few hours of work Eclipse uses 1-4% of a single CPU core (instead of 380%).
One more thing to note: as I didn’t find the obvious way of disabling the JavaScript support for my existing project, I simply closed Eclipse, opened the .project file in other editor and removed the JavaScript Nature line (org.eclipse.wst.jsdt.core.jsNature). And voilà! Problem solved.
Thank you very much! That solved my problem.
I’m working on several machines for several projects and only on one of these systems i had this stupid 100% CPU-Eclipse problem.
This bug is very hard to find, so thanks a lot for saving me a lot of time!