perf: move some of the perftags benchmark to the setup function
Creating fresh objects and clearing the cache should not be part of the
timing.
before: ! wall 0.020851 comb 0.020000 user 0.020000 sys 0.000000 (median of 138)
after: ! wall 0.018740 comb 0.020000 user 0.020000 sys 0.000000 (median of 141)
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