Not just slows it down - hangs it solid. No hourglass, no nothing. I just click on it and bam, the handset stops dead in it's tracks. I have to do a battery pulls to get it back.
4.5.0.160 - the latest as far as I know! Wireless update says it's all hunky-dory and up to date. This worked until I upgraded BB Appworld. I should have known better.