I've used this tool almost as long as I've used git, but it seems the upgrade to Tahoe (or some other recent change, like Xcode's git) has caused it to be come unusable for me. When I stage a file, there is a temporary spike in processes that recovers. When I stage the second file, however, the spike in running processes goes up by ~5000, and stays there. All 10 cores are maxed out. Here is a before and after process list view

I have to Force Quit GitX, at which point the process count starts to fall off until it recovers. Looks like I'm finally going to have to switch to something like Sourcetree, as much as I'll miss this app. This was on the latest release, 1.0. If there is a test build that may already have a fix for this issue, I'd be willing to test it out. I've never built this particular app from source, however, and not sure what that entails.