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: -

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)