Why is MATLAB Editor slow to respond in MATLAB 7.8 (R2009a) on a Linux (Ubuntu 8.10) System?

The MATLAB Editor is slow during typing and scrolling for files of length on the order of hundreds of lines. Extremely short files (just a few lines) do not have this problem. The characters of the file open in the MATLAB Editor get mangled when I use the scrollbar.

The MATLAB Command Window is also slow when typing and scrolling.

Answer 1

[MathWorks Support Team]

When scrolling in the MATLAB Desktop (e.g., in the Editor or Command Window), the graphics and characters become garbled with painting errors.

This is due to a misconfiguration of the X server with respect to the graphics card. A workaround is to include the attached java.opts file in your MATLAB startup directory.

The Java.opts file must contain the following tag:

-Dsun.java2d.pmoffscreen=false