I hate it when a program that has been working find suddenly decides to start acting like it's got a bad case of Mesothelioma and either runs sluggishly or just plain crashes constantly.
For example in a recent video where I was recording Minecraft gameplay, Minecraft suddenly started crashing repeatedly. It made recording a 22 minute video take well over an hour. Not only that but the video didn't turn out nearly as good as I wanted.
At least it was mostly passable though and since then I have found and corrected the problem that caused the crappy performance.
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