I'm using Sourcetree on Windows with Git-Flow. It works fine, but it's really slow. It takes about 15 seconds just to show "Choose Next Flow Actions" or other dialogs. I tried it even on small test repository with no difference.
Is this normal? My collagues have same problem.
I'm running on quite standard laptop - Win7 64bit with 8GB RAM and SSD drive 
So far I reverted back to use command line, but as I wanted to show sourcetree and git-flow to colleagues who don't know much about git Sourcetree seemd to be awesome option for them.
Martin