We got a report over in astral-sh/uv#17831 that the uv benchmark had significantly regressed so I briefly investigated and as noted in astral-sh/uv#17831 (comment) the issue is that we're resolving to a different version of a package (python-rapidjson) which takes >10s to build (on my machine) and creates a dramatic difference in the benchmark.
I think that --no-build or --only-binary :all: should be used so you're not including package build time in benchmarks.