Shareraza (RAZA) are reknown as slow uplders! That's b/c they're often offering their upld bandwidth on other networks. raza users have a lot of good & hard to get files though so banning them might not be helpful if you're after hard to get files. The difference is how much bandwidth users offer or have available to share for uplding since some may be sharing several slots with many people. Also of course some connection speeds are not so generous for upld speeds.

Try re-searching the topic to see if you can find more sources to the file.