Glyphs' performance becomes laggy after 10-20 minutes usage

My Glyphs app’s performance behaves laggy after 10-20 minutes usage, but when I restart the app, everything’s back to normal for a while then starts to slow down after such time of usage.

I’m on macOS Catalina (Macbook Pro 16"), so I don’t think this has anything to do with my computer’s hardware capacity.

Can you try to run Glyphs without any plugins? Hold down Option+Shift when you start the app.