OMG! I know how it feels! I was trying to play Elder Scrolls on my PC but in low graphs it get stuck sometimes, the fps went from 25 to 10 I don't know lol, but it was really awful, you were really brave to do this haha!
That's the love for doom, it reminds me one of my best friends that is a huge fan of DOOM.
The new DOOM games have this Vulcan runtime environment, its like directX but not, seems to get a higher frame rate than direct x games.