No makers of Limewire here :wink:

A qualified guess though would be that you have A LOT of incomplete files. Try cancelling all downoads and then (after closing Limewire completely) delete your incomplete folder. Limewire will create a new one on next startup.

If not then you will have to provide more info on your setup.

BTW Defragmenting could help as well. Also reinstalling Java

Maybe deleting your preference folder will help. (Note: This will delete all settings in Limewire. You will have to set up everything in it from scratch.)