Fix safe performance offences #253

Job	Run time
Tests (2.7, rails_6.1, stable)	44s
Tests (2.7, rails_7.0, stable)	39s
Tests (2.7, rails_7.1, stable)	50s
Tests (3.0, rails_6.1, stable)	22s
Tests (3.0, rails_7.0, stable)	19s
Tests (3.0, rails_7.1, stable)	27s
Tests (3.1, rails_6.1, stable)	23s
Tests (3.1, rails_7.0, stable)	27s
Tests (3.1, rails_7.1, stable)	29s
Tests (3.2, rails_7.0, stable)	27s
Tests (3.2, rails_7.1, stable)	27s
Tests (2.7, rails_edge, experimental)	57s
Tests (3.0, rails_edge, experimental)	47s
Tests (3.1, rails_edge, experimental)	56s
Tests (3.2, rails_edge, experimental)	28s
Tests (head, rails_6.1, experimental)	1m 24s
Tests (head, rails_7.0, experimental)	1m 24s
Tests (head, rails_7.1, experimental)	1m 23s
Tests (head, rails_edge, experimental)	1m 25s
Coverage	3s
	14m 21s

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