When you're trying to download a large file that has lots of users use auto search more to find 50+ users.
Then press the box with the + in it next to the file you want so that all the individual users are displayed.
Then press the bandwidth button at the top of the screen twice so that the users are listed highest bandwith down to lowest bandwidth.
Then start the download.
This way kazaa will try to get the file from the highest bandwidth users first, instead of whatever order it found the users in.
This trick will help you get fast connections right away instead of filtering though all the low bandwith users untill kazaa comes up with the good ones.
Let me know if this helps.