Performance Shift(s): `3820ae21`

[github-actions]

Benchmark comparison has identified performance shifts at commit 3820ae2 (#4618). Please review the report below and take corrective/congratulatory action as appropriate 🙂

Performance shift report

       before           after         ratio
     [35d97ed9]       [3820ae21]
     <main~3>         <main~2>  
-      2.60±0.8μs       2.00±0.2μs     0.77  experimental.ugrid.MeshLazy.time_return(6)
-        0.359375        0.1640625     0.46  netcdf_save.NetcdfSave.track_addedmem_netcdf_save(1, False)
-         0.09375       0.05859375     0.62  regions_combine.CombineRegionsCreateCube.track_addedmem_create_combined_cube(4)
       before           after         ratio
     [35d97ed9]       [3820ae21]
     <main~3>         <main~2>  
+             0.0        0.1328125      n/a  regions_combine.CombineRegionsComputeRealData.track_addedmem_compute_data(4)

Generated by GHA run 1954280682

[trexfeathers]

The time_return benchmarks need to go - they're useless.

The track_addedmem benchmarks are solved by #4621.