Hey, so I’ve been playing DB for a number of years. Several patches ago I used to be able to play at a stable 144 FPS, and that’s seemed to dwindle with each successive patch. Now usually playing around 88 most of the time–and that’s on minimum settings. I have a high end machine, and have no problems running Overwatch over 200fps. Someone please provide some guidance.
CPU: i5-4690k @ 4.3GHz
GPU: GTX 1070
Ram:16gb DDR3
I have a 1070 as well and I was having a similar issue, but it was more like I was having high fps, but it felt like it was low. This fixed my problem, so hopefully it helps you out.
Navigate to your Documents\my games\UnrealEngine3\ShooterGame\Config to find the ShooterEngine.ini and edit these.
“bUseTextureStreaming=True” (these are default for most but not all UE3 games)
“bUseBackgroundLevelStreaming=True”
“MipFadeInSpeed0=0” (these even out mipmap loads and draw time)
“MipFadeOutSpeed0=0”
“MipFadeInSpeed1=0”
“MipFadeOutSpeed1=0”
“PhysXGpuHeapSize=64” (these balance physx calls even on cpu based physx titles)
“PhysXMeshCacheSize=16”
“bSmoothFrameRate=TRUE” (this really does need to be on, ignore what you’ve read)
“MinSmoothedFrameRate=30” (keep these right here. setting higher/lower does no good)
“MaxSmoothedFrameRate=400”
“DisableATITextureFilterOptimizationChecks=False” (driver based opt is MUCH faster)
“UseMinimalNVIDIADriverShaderOptimization=False” (same here)
“PoolSize=256” or (vidmem/poolsize exmpl: 512/128, 1024/256, etc, DO NOT exceed 768)
[I set mine to 768, if you have the 8GB vRAM model then do so as well.
“bAllowMultiThreadedShaderCompile=True” (should already be on by default)
“ThreadedShaderCompileThreshold=4” (formulate like this: # of cpu-cores (not threads) -2)
“OnlyStreamInTextures=True” (reduces overall texture batch call size)
Hey dude. Thanks for sharing this information! I was able to get over 200FPS when in game, and I was doing black flips! But then performance slowly degraded down to 80fps and just hung out there. This is so frustrating! 
It might be linked to changes in the map. It was on Dome, and I noticed losing FPS as soon as the enemy cleared the first obj and and opened the next part of the map.