When running Beetlepsx on my PC I’m getting shockingly low performance at anything above 1x resolution. 4X is a slideshow and 2x has distorted audio and frequent hiccups.
The game I’m using in my test is Threads of Fate. I’ve tweaked a lot of settings and the only thing that seems to tank performance is upping the resolution. I get significantly better results if I go into the retroarch menu before launching the game or loading the core and set the video backend to Vulkan.