I'm on an early 2013 Macbook Pro - it's not a slow machine.
Yet whenever an autosave occurs Fusion 360 beachballs. The app becomes completely unresponsive until the autosave is complete. It doesn't care if you're right in the middle of working out a difficult sketch, or dragging an extrusion, if you're idle, or if you manually saved 2 seconds ago. You're stuck for at least 5 seconds.
Blocking all human interaction while an automatic process happens at regular intervals breaks just about every common-sense rule of human interface guidelines ever published.
The only time a user should ever know an autosave occurred is when the app crashes and they see the impact of the crash was negligible because autosave did its job. If autosave gets in the way of a user's design flow it encourage the user to turn it off.
In the case of Fusion 360, I see that beachball a lot. Because the app is prone to crashing (still), I have autosave set to save as frequently as possible. And because crashes are often preceded by beachballing, I never know what to expect. Is it autosaving, or am I crashing? Looks like it was an autosave. Now what was I just doing?
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