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We also could have used the Find feature in gitk to find the same commits. Open gitk with the --all switch, type Performance in the Find field, and hit Enter. This will highlight the commits in the history view, and you can navigate to the previous/next result by pressing Shift + up arrow, Shift + down arrow, or the buttons next to the Find field. You will still, however, be able to see the entire history in the view with the matching commits highlighted:

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