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Possibly a lack of graphics power. Fusion 360 requirements say M1 and 4Gb RAM is minimum, recommends M1 Max and 16GB. M1 Max is about 3.5x the graphics power of M1 and also has more graphics power than M2 and M2 pro. M2 Pro comes close though.
Think you’d only see improvement going to M2 Pro or better. You’d have to get a Mac Studio to get a ‘Max’ chip which is where the graphics really steps up.
2020 M1 MBA, 16GB of RAM. I’m assuming it’s the lack of graphics acceleration (relative to a more powerful machine) that is the issue with handling mesh objects?