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A.2.2 I changed several thousand files at once and now Magit is unusable

Magit is currently not expected to work well under such conditions. It sure would be nice if it did. Reaching satisfactory performance under such conditions will require some heavy refactoring. This is no small task but I hope to eventually find the time to make it happen.

But for now we recommend you use the command line to complete this one commit. Also see Performance.