Comment 1 for bug 405166

I tested this and it did take 28 seconds on a fairly cold cache (without dropping buffers.) It produces roughly an 8MB diff. (You realize this gives the whole diff to your working tree, not the changes in that one commit?)

For me, getting the diff from the wt to its basis revision is 0.4s, which is more what it should be.

Paul, in general if you're reporting a performance problem, attaching the lsprof output helps diagnosis. (We should mention that in the bug-filing guidelines...)