Very slow Eclipse 4.2, how to make it more responsive?

I'm using Eclipse PDT on a rather large PHP project and the IDE is almost unusable. It takes nearly 30 seconds to open a file, and other actions, like selecting a folder in the file explorer, editing some text, etc. are equally slow.

I followed various instructions to speed it up but nothing seems to work. This is my current eclipse.ini file. Any idea how I can improve it?

-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20120522-1813
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-server
-Dosgi.requiredJavaVersion=1.7
-Xmn128m
-Xms1024m
-Xmx1024m
-Xss2m
-XX:PermSize=128m
-XX:MaxPermSize=128m
-XX:+UseParallelGC

System: Eclipse 4.2.0, Windows 7, 4 GB RAM

It looks like Eclipse in silence have created a fix and announced it in all secracy through their wiki (!). It seems to alleviate the problems for me at least; though I have not tested it in length yet.

See http://wiki.eclipse.org/Platform_UI/Juno_Performance_Investigation

Basically you should install the "Juno SR1 Patches/Eclipse UI Juno SR1 Optimization" from their 4.2 update site: http://download.eclipse.org/eclipse/updates/4.2

Bug-tracking for this optimization: https://bugs.eclipse.org/bugs/show_bug.cgi?id=394588

There are known performance issues with PDT 3.1 and eclipse 4.2 (juno).

https://bugs.eclipse.org/bugs/show_bug.cgi?id=385272

This is the solution:

Open a different perspective (for example java, but not php) and restart eclipse. Afterwards you can savely switch back to php perspective. Eclipse will have no performance issues.

Also mentioned here

Actually in looking at your machine configuration, you should make sure nothing else is going on in the machine and experiment with reducing your required memory, say something like -Xmx512m. If you are requesting too much heap space, then it's possible you are doing a lot of OS paging.

There is also a known bug which makes eclipse juno slow on some systems :

https://bugs.eclipse.org/bugs/show_bug.cgi?id=385272

A workaround seems to be to delete the workbench.xmi file.

From http://wiki.eclipse.org/Platform_UI/Juno_Performance_Investigation

1. Ensure you are already running on a package from the Juno SR1 release (September 2012)
2. Invoke Help > Install New Software
3. Select this repository: http://download.eclipse.org/eclipse/updates/4.2
4. Expand Juno SR1 Patches and install Eclipse UI Juno SR1 Optimizations

Worked for me

I was having similar issues with the Eclipse and the ARM emulator running. When I switched from tab to tab on Eclipse it would take 5 seconds for it to switch over and Eclipse would be in a "Not Responding" mode for a moment. I actually increased my heap memory on my eclipse.ini by using -Xmx1024m. It fixed the issue.

I had very big UI performance issues upon switching to 4.2 (using PDT) and after investigating for a while, I noticed it was due to... the PHP perspective. That doesn't make any sense, but I could confirm it on two different computers.

Try switching to another one (like, the Resource one), then restart Eclipse (last part is important).

Let me know if that helped.

I was having huge problems with performance (switching between editor windows was SLOW). I modified the eclipse.ini file to use -Xmx1024m rather than -Xmx512m and the performance is much better.

Update -- After a while I started noticing the fix above did not make my problems go away entirely. I did find another post above helpful. I install the Spring Source Toolsuite plugin and I believe that may be the source of the slowness. After installing the patch at the following link, Eclipse is running much more smoothly: http://wiki.eclipse.org/Platform_UI/Juno_Performance_Investigation

Eclipse 4.2 Service Release 2 was released a few days ago (1 Mar 2013. It is the result of the all of these investigations and the patches suggested previously. Give it a shot!

Make sure you have turned off "show whitespace characters" on Linux. (https://bugs.eclipse.org/bugs/show_bug.cgi?id=320595)

I'm using Eclipse 4.2.2 version for Developing android Apps. But its slow when coding my applications. (not XML graphical layout or Android Emulator)

I'm using NetBeans also, but it's working really well!

Specially I want to notify here I've added many more plugins to Eclipse and now I've uninstalled all of that. Now there is only ADT Plugin with Eclipse Base Plugins.

I've seen some best settings for speed up eclipse UI.

I want to know what's the best settings for my laptop.

Windows 8.1, 12 GB Ram.

at lastly sorry for posting here, I cant post any questions because I'm blocked.

I hope best solution from here.