Benchmarking tweaks

[SolarDrew]

Couple of small changes - add a non-plotting benchmark in the hope that that will prove more useful for coparisons, and only run the plotting ones twice so it doesn't take ages.

[SolarDrew]

Well this hasn't made it any quicker it seems 🤔

[codspeed-hq]

CodSpeed Performance Report

Merging #383 will improve performances by 63.93%

_{Comparing SolarDrew:benchmarking-codspeed (61dd540) with main (448787d)}

Summary

⚡ 1 improvements
✅ 1 untouched benchmarks

🆕 1 new benchmarks
⁉️ 5 dropped benchmarks

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

Benchmarks breakdown

	Benchmark	main	SolarDrew:benchmarking-codspeed	Change
🆕	test_pixel_to_world	N/A	2.7 s	N/A
⚡	test_plot_dataset[axes0]	72.7 s	44.3 s	+63.93%
⁉️	test_plot_dataset[axes1]	11 s	N/A	N/A
⁉️	test_plot_dataset[axes2]	14.7 s	N/A	N/A
⁉️	test_plot_dataset[axes3]	74.5 s	N/A	N/A
⁉️	test_plot_dataset[axes4]	17.3 s	N/A	N/A
⁉️	test_plot_dataset[axes5]	15.1 s	N/A	N/A