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ORACLE-BASE - OS Authentication (http://www.oracle-base.com/articles/misc/OsAuthentication.php)

It's probally IO related.

does "ps aux" give processes in de "D" state?

What is the output of the "dmesg" command, and what is the filesystem type ("cat /proc/mounts" the type is the third column)?

Make sure that your local xserver is listening for incomming connections (on the machine you initiate the connection from), then make sure you authorize the xclient to connect to it.

man xhost...

It's the time a process last accessed it to read/write contents.

If the process is still running and did not yet close the file descriptor you can recover it directly via the file descriptor in /proc (on linux)

Performance is often IO related. As the poster above me suggests tools like iostat, vmstat, top, ps etc can help you with this.

If you are lucky sar is configured and running, that might also...

cfengine.org (http://www.cfengine.org/) might also be a solution.