I was under the impression modern browsers suspend background tabs to some extent? But anyway, you're talking about a very specific use case that only partiall

I was under the impression modern browsers suspend background tabs to some extent? But anyway, you're talking about a very specific use case that only partially generalises. I'm typing this on an 2014 11" MacBook Air 6,1 i5-4260U CPU @ 1.40GHz, 2001 Mhz, 2C / 4T with 4GB RAM running Windows 10 with two Chromium Edge and Firefox, 2D CAD and vector graphics programs running.