Hi:

I know of no way to increase Jave Heap size, but after going back and forth for about a week with Limewire tech support, I was able to determine that the number of files being shared and the number of files waiting in the download que seems to effect the Java heep memory - If you keep your shared files to under 1000 and don't have more than a few waiting files it seems to run ok without the constant internal java heep errors - I hope this helps.