We're not aware of any hangs on launch related to 10.12.6 (or in general.) Please sample the application using Activity Monitor and attach that here for us to review. You might try setting aside your preferences as well to see if it's something specific in there. Apologies for the hiccup.
Senior Mac Developer, Sourcetree
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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