Issue
Sometimes, running Matlab on a remote Linux computing server may run slowly when using X-Win32.
Solution
Disable offscreen pixmap support in Matlab.
How To
In your unix home directory, there should be a file called 'java.opts'. If it does not exist, create it.
Add the following line:
-Dsun.java2d.pmoffscreen=false
Then re-start the X-Win session.