Performance Shift(s): `45f188bb`

[github-actions]

Benchmark comparison has identified performance shifts at commit 45f188b (#4627). Please review the report below and take corrective/congratulatory action as appropriate 🙂

Performance shift report

       before           after         ratio
     [ad17088e]       [45f188bb]
     <main~1>         <main>    
-      1.90±0.6μs       1.50±0.2μs     0.79  import_iris.Iris.time_fileformats_pp_save_rules
-        0.234375       0.05078125     0.22  netcdf_save.NetcdfSave.track_addedmem_netcdf_save(1, False)
-      0.30859375             0.25     0.81  netcdf_save.NetcdfSave.track_addedmem_netcdf_save(1, True)
       before           after         ratio
     [ad17088e]       [45f188bb]
     <main~1>         <main>    
+             0.0       0.07421875      n/a  regions_combine.CombineRegionsCreateCube.track_addedmem_create_combined_cube(4)

Generated by GHA run 1960139975

[trexfeathers]

All fine, thanks @github-actions 🙂