Hello. I recently switched my GPU, a GTX 770 (4GB), to the second slot on my motherboard. I noticed that Dirty Bomb became very laggy and I had tried to lower the graphics as much as I could using custom graphics configurations and while this did help the problem somewhat, it did not eliminate it.
Through some testing, it appears that setting HUD alpha to 0 eliminates the stuttering.
Of course it’s a lot harder to play the game this way.
Other relevant information:
i5 2500k @ 4.7GHz
16GB RAM
Windows 10 Pro 64-bit