I tried out diet version add on and notice a lot of setting but no advantages over kazzalite on its own,i also experience slow downloads at times and at other times i get 150-170k which is over and above my 1024k modem,128k download speed same as i used to get 70k when i had 512k modem with 64k download speed.
It as the guy above says it just depend on other users speed and if he has limited it and traffic and wher in the world he is.
I used to limit upload speed but after reading site its better to leave up full and let user get the file from you as fast as possible for 2 reasons,1 they will be off your back sooner and 2 they will now have file to share also as in grand pri 4 ,i think i found the only user that had working copy when it first came out,it took me a week to download as he was offline most times after that everyone was downloading from me so it like a tree branchimg out with more and more getting it and in turn sharing it so you will find more user when you leave the speed up tool running.