Writing events is very expensive #1
Description
I've been noticing this while doing some profiling of Paint.NET: the Systrace stuff is actually pretty expensive! It was significantly skewing the results of some benchmarks I was trying to perform, and causing me to come to the wrong conclusion (that the new version, 4.2.2, is slower than the old one, 4.2.1) by a wide margin.
From analysis in WPA, the time seems to be getting sunk into lock contention. I'll have to look into whether flushing is being done correctly, too.
I think the strategy of having a dedicated thread for writing events is worth looking into.