1. Tip: Purge the Downloads Queue! (click on blue link)

2. Keep shared files down to less than 2,000 or even less than 1500.

3. There is a new version out ... it might be worth trying it.

4. You might also try deleting your LW preferences folder whilst LW is closed & found here:
/Users/your_username/Library/Preferences/LimeWire

Sorry for late response.