Imaris
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Builds. Are you using them?
Added 29 minutes later
Of course, you can use it from scratch, but it's silly when there are tons of builds, and some of them are quite good.
By the way, I'm using QIP PDA and haven't had any problems, so it's unlikely to be QIP's fault; maybe you have a corrupted client?
And lol, QIP PDA is something completely different; it's on my communicator, and it doesn't lag like 2010 on a computer.
Although it lags in a different way there.