Trace mode slow? Test this patch.

Ryan Schmidt ryandesign at
Thu Feb 10 03:57:45 UTC 2022

On Jan 30, 2022, at 12:25, Clemens Lang wrote:
> Hi developers,
> I recently noticed that trace mode was significantly slower on modern
> macOS than it used to be, and found some time to investigate the root
> cause.
> If you saw the same, please test the current master branch state with
> It should return your trace mode to previous speeds (about a 6-8x
> improvement compared to how slow it currently is).
> I've also done some benchmarking and have a few more patches in my
> pipeline that should bring a bit more (but rather minor compared to
> this) improvements.
> HTH,
> Clemens
> P.S.: I have not reported this problem to Apple. If somebody wants to
> verify that it occurs with all uses of copyfile(3), it would be nice if
> they could let them now.

Thanks Clemens. It's much faster now!

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