You might be able to use msi AfterBurner or similar software to print useful info (CPU/GPU usage) to the screen while you are in-game. In another tech support topic I gave a very detailed explanation of how I tweaked my video settings and some of those tips might help you to debug your issues too: Performance Problem Do I have a bottleneck? For this reason I recommend tweaking the video settings by starting a custom game. I have tried with ultra and very low settings, but it does not affect the fps. In Oblivion they are seperate cells, so they are not loaded with the landscape around. I am running the game on a 2080ti with i9 9900k but i am still hitting fps all the way down at 45. The reason is the engine, wich isn't optimized to run with such a high number of objects. But in the wilderness and in dungeons/interiors the performance should be fine. On the hero selection screen the GPU usage is a bit higher than during normal gameplay (probably because of the blur effect on the background). I get around 10 fps in Erothin and maybe 15-20 in Ostian. On the login screen the game uses the in-game fps while in the main menus it always caps the fps to 60 (because it would make no sense to stress the cpu when you aren’t in action, 60 is very good for clicking menus). I could upgrade to a GTX 1080 but I don’t play a lot of different games and OW looks good enough with my current setup so that I didn’t bother with an upgrade. In order to achieve stable 120fps I’m not running with max (only high) graphics settings but it looks wonderful. Since I’m using a fix renderscale of 75% it means that the rendering is done basically in 1080p like in your case. My spec is i5 8600k, 16GB RAM, GTX 1060 6GB and I’m using an 1440p monitor.

Oblivion low fps on high end pc