I "rediscovered" David Ahl's now-historic BASIC benchmark program from the early 1980s, and did an article about it here to compare its runtime on most of the 8-bit systems I still have:
https://voidstar.blog/exploring-project-ahl-in-2024/
This would be the same David Ahl of the Baccarat software
viewtopic.php?t=7254
In some old homebrew computer club newsletter, there are other BASIC benchmarks from ~1978.