Some tips:

* Tip: Purge the Downloads Queue!
* After opening LW wait 10 to 20 mins before using. Let it settle down 1st.
* Go to Tools>Options>Speed & tick disable Ultrapeer Cap. & press apply button.
* Set both uplds & downlds to autoclear.
* Close all LW windows you don't need open at that time.
* You might also consider reducing shared files if you have multiple thousands of them.
* Also don't use the Resume/Find Sources button on all incomplete files. This can have side-fx such as affect LW's connection quality. This will also stress LW & your comp. If you use Resume/Find sources then just apply it to a couple or so at one time.
* Reduce uplds to about 70-80% or more. Reduce downlds to 80 or 90%.
* Disable LW's media player so your default player opens instead (Tools>Options>Player & untick option & press Apply.)
* If you're not actually actively using LW then hide it in the background or in the program tray (minimized.)