We are experiencing serious issues with our Jenkins setup.
The setup consists of one master (2core, 3GB) and two slaves (6core, 6GB) connected via SSH.

If someone saves a setting - either global or a job one - Jenkins becomes unresponsive. The saving page keeps on loading generally and the dashboard becomes unavailable. Some subpages still work strangely.

After a period of time the webinterface works again, but this varies from 5 to 30 minutes and is not acceptable behaviour.

We do have quite a few plugins installed (some got added as dependency to another):

• ansicolor
• ant plugin
• checkstyle plug-in
• chucknorris plugin
• credentials plugin
• duplicate code scanner plugin
• external monitor job type plugin
• git client plugin
• github api plugin
• github plugin
• github pull requests builder
• green balls
• html publisher plugin
• javadoc plugin
• jenkins active directory plugin
• jenkins clover plugin
• jenkins email extension plugin
• jenkins exclusion plugin
• jenkins git plugin
• jenkins gravatar plugin
• jenkins instant-messaging plugin
• jenkins irc plugin
• jenkins jdepend plugin
• jenkins JIRA plugin
• jenkins jQuery plugin
• jenkins mailer plugin
• jenkins notification plugin
• jenkins phing plugin
• jenkins post-build script plug-in
• jenkins sonar plugin
• jenkins violations plugin
• job import plugin
• LDAP plugin
• Matrix authorization strategy plugin
• Maven integration plugin
• PAM authentication plugin
• Performance plugin
• Plot plugin
• PMD Plug-in
• SCM API Plugin
• Simple Theme Plugin
• SSH Agent Plugin
• SSH credentials Plugin
• SSH slaves plugin
• Static Analysis Collector Plugin
• Static Analysis Utillities
• Subversion plugin
• Template project plugin
• Timestamper
• Token macro plugin
• warnings plug-in
• xUnit Plugin

All our plugins are the latest version.

If you need any more information or have any pointers to where this issue can be originating from that would be very helpful.

This not only affects the gui but processing/crons etc are all stopped (e.g. GHPRB doesn't run, periodic builds aren't executed)