Note: This is intended for more advanced users. If anyone wishes to write a comprehensive step-by-step howto, please let us know and we will post it as a sticky.

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The latest version of java allows you to really speed up the responsiveness of the Limewire GUI in a simple way:

1. upgrade to the latest Java (1.5.0 a.k.a. 5.0) from http://java.sun.com

2. make sure you have OpenGL-enabled X server. That means you should make sure the necessary server extentions are enabled. Also, if you are using an nVidia graphics card, you need to get the official driver from their website.
If you know (links to) good instructions how to do this for different graphics cards feel free to post them in this thread.

3. once you have done the first two steps, go to the directory where you installed Limewire and open the file runLime.sh with an editor. replace the line:

java -jar LimeWire.jar

with

java -Dsun.java2d.opengl=True -jar LimeWire.jar

The next time you start Limewire it will print out whether it successfully enabled the OpenGL pipeline. Once you know that everything works you can change the "True" to lowercase "true" and it will not print the message anymore. If java fails to initialize the pipeline, it will fall back to the default behavior - so you lose nothing by trying ;-)

Enjoy!