Had about 44 changed files pending in my dev instance.
Clicked "Commit Changes" at the top (to get to the Git tab), and the page froze for about a minute.
Did not have this issue on previous versions.


(browser task manager, it got even higher then in the screenshot for both size and CPU)
I think this is due to all checked files being loaded at once when the page opens.
I suggest the content of the changed files to be loaded upon expanding the change editor and having all changes closed by default.