On Mon, 02 Mar 2026, Jeff King [off-list ref] wrote:

On Mon, Mar 02, 2026 at 03:27:22PM +0100, Patrick Steinhardt wrote:

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I don't have the benchmark setup and it might be easier for you to
confirm?

All you need is a normal development infra and hyperfine. The
benchmarking scripts in the repo I linked should then "just work" with
the above invocation.

Thanks, these were very cool and easy to use.

Looking at the patch, my guess was that the problem is that we are now
setting up and tearing down the sideband muxer for each hook invocation.
This is expensive for the "update" hook, since it fires once per ref.

I independently root caused it and came up with (mostly) the same fix,
so this is a very good confirmation, thanks!

Please wait for my patch because it needs fixing it 3 places, for 3
hooks which spin up/down no-op async threads. :)