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The last GOOD commit was Commit ba9315b1641b483f2bf843c38dcdba0cd1643a55 Emacs 29.0.50 Modify after narrowing: 0.080 s elapsed, 0 GCs, 0.000 s GC, 0.080 s non-GC Modify before narrowing: 0.073 s elapsed, 0 GCs, 0.000 s GC, 0.073 s non-GC The first BAD commit showed a slowdown of a significant factor Commit 9dee6df39cd14be78ff96cb24169842f4772488a Emacs 29.0.50 Modify after narrowing: 0.734 s elapsed, 9 GCs, 0.051 s GC, 0.684 s non-GC Modify before narrowing: 0.153 s elapsed, 9 GCs, 0.052 s GC, 0.102 s non-GC Then a further order of magnitude slowdown shows up around Commit 321d4e61551a0f6dfb1abfc0b54e6177735bde58 Modify after narrowing: 7.954 s elapsed, 3 GCs, 0.022 s GC, 7.932 s non-GC Modify before narrowing: 0.122 s elapsed, 3 GCs, 0.023 s GC, 0.099 s non-GC Hope this info is helpful. -- Andrew Cohen