No, this isn't the standard post about how much worse sourcetree is on Windows (it is), or how annoying it is that it must "install" itself every time you open it in windows (which does take forever).
I've used other software that is too slow to use on Windows (cygwin!), but in most cases I can tell my antivrius software (bitdefender) to ignore the install folders. That make things usable.
It doesn't seem to work for SourceTree. I've told my antivirus to avoid me\AppData\Local\Sourctree, but the program is still insanely slow (like 30 seconds to do anything).
Does SourceTree "install" itself to some temporary location that also need to be "white listed" for the antivirus?
Just to say something positive, SourceTree for OS X remains a very good program.