More benchmarking tweaks

[SolarDrew]

Try slower plot again to see how it does now with performance improvements from #370. I don't expect this to be merged soon, or even worked on necessarily, but I'm interested to see how fast we can get the longer plots running.

[codspeed-hq]

CodSpeed Performance Report

Merging #387 will degrade performances by 99.94%

_{Comparing SolarDrew:benchmarking-codspeed (9bdefbe) with main (fdcf97d)}

Summary

❌ 2 regressions
✅ 1 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	SolarDrew:benchmarking-codspeed	Change
❌	test_pixel_to_world	940 ms	1,582,305.3 ms	-99.94%
❌	test_plot_dataset[axes0]	27.8 s	498.6 s	-94.43%