Not the OP, but this is super cool as a way to measure extensions' performance impact (in a super limited way, admittedly). For me…

  Chrome 99.0.4844.51:
  - 1Password + µBlock Origin: 277 ± 2.9
  - No extensions:             303 ± 5.1 (9% faster)

  Safari 15.3:
  - 1Password:     251   ± 2.6
  - No extensions: 280.5 ± 2.6 (11% faster)

On Safari, just Wipr. On Edge, I've got Netflix Party. I don't think 1Password is enabled in either of them.