JTAG ICE - watch your watches...

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If you find your JTAG ICE is taking a long time to single-step, make sure you've emptied your watch window of all unwanted variables. Every time the ICE single steps, it has to download each variable from the AVR, and that can take a while if you've got a lot of variables (or large structures/arrays) in your watch window - I was seeing step times of 4-5 seconds with 800 bytes of watches... With the other ICEs it was easy to forget to delete watches after you were done with them, but this JTAG speed penalty ought to be a good reminder :-)