I've developed a new benchmark app to test the performance of your Garmin device:
https://apps.garmin.com/en-AU/apps/be0a1d2d-84d2-4c75-8603-9971bc221a9b
It's based off my "Mercenary" watchface. The "wolfmark" benchmark score is displayed once the progress bar is complete.
It's a real-time raycaster, nothing is pre-calculated.
The actual benchmark itself tests both the screen rendering, and the cpu performance of the device.
I'll be extending the benchmark to report on the device, firmware and wolfmark score.