UPDATE!!!

UPDATE: Although I bought two M.2 cards for my desktop, unfortunately, it seems they're not compatible with my motherboard (even though everything indicated they would be). Fortunately, my notebook was compatible, so I installed one, and the programs now run much better. It's not a permanent solution, but at least this should allow me to work normally again for a few months, until I completely update my desktop. I'll probably have to buy a new motherboard and CPU (though hopefully not a new graphics card), so that will take time. For now, I'm flying to work with everything I need, and I hope to have the Persona 5 comic ready by next week. Again, sorry for the inconvenience.