Wow you're not careful about what you download are you. Don't download anything under 2,000 KB (2 MB). Get used to using the junk filter & learn how it works since it's a learning filter.

Now for performance & drag... try these things

(1) Tip: Purge the Downloads Queue! (description for mac but is applicable for windows!)

(2) Don't use the resume/find sources on all your incomplete files. Instead just apply it to 2-3 files at a time. This will make your OS, LW, & modem/router perform better rather than being inundated with a mass of requests at once.

(3) After updating to pro, it's often recommended to delete your LW prefs folder.
Delete your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)

That's right LW has no spyware, etc. But the gnutella network does. Why? The groups who spam the network are the ones. You'll get an idea of who after looking thru these links: Recognising fake files

BTW it's internet etiquette re: caps. We learn something new everyday. Well hopefully.