I am having a hard time getting my prototype to work as promptly as I had before updating to Sonoma. My activity monitor is saying that I have a range of about 800 or less RAM when using the Present screen. Before I had no issues just testing out my prototype.
MacBook Pro 2020
Thanks for reaching out. Could you please try basic troubleshooting to see if the performance will be improved? You can check the steps here: https://help.figma.com/hc/en-us/articles/360040523973-Technical-troubleshooting-tips#Basic_Troubleshooting.
If the problem persists, our support team can look into it, so please reach out to them here: https://help.figma.com/hc/en-us/requests/new.
Hey not sure if you isolated the issue but I had the same thing happened. Booted in safe mode and found it was the Figma agent login item. Taking it off of login items solved the issue for me, got just about same specs as you.