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Are you running at a very high resolution and/or MSAA cranked to max?
HBAO, 2x anisotropic, High FXAA, MSAA off, DX11, everything else on High VSync off (bcoz of W8.1) and about 100 fps
Why is turning VSync on with Windows 8.1 a problem for you?
Highly doubt Windows 8.1 is your issue . I have no problems with forced nvidia vsync at all. There no such issue with directx libraries in windows 8.1 . Something else is messed up in your system mate .
Amd fx 4100 3.6ghz
Radeon R9 280 3gb
So tell me, why de f*** a lot of people have this issue...
http://answers.microsoft.com/en-us/windows/forum/windows8_1-gaming/windows-81-very-low-fps-in-games-common-fps-drops/b6e53085-2258-4b60-9f49-bd3431925a8a
Idk mate . Mind you I optimize the hell out of my operating system , I am literally running barebones just purely for gaming , I have disabled all unnecessary background programs/services windows 8.1 comes with . Ontop of that I have turned off all unnecessary resource hogging features windows 8.1 automatically activates such as skydrive bs , etc. It also has a ton of scheduled hidden tasks in the task scheduler that could completely ruin gaming performance , turned those off too. I've also taken care of my hardware settings in device manager , making sure there's no conflicting IRQ's etc, and in my BIOS. And updated all my drivers including chipset drivers. Also fully updated windows . Some resource hogging crap windows comes with for example is windows defender service , anti malware service , windows security centre constantly checking for updates , all that and more will kill performance . Another big thing is the indexing service , kills hard drive performance . There's a lot more that one has to disable to get proper performance , I can't list th all but it took me a very long time to fully optimize windows , including a lot of core registry fixes to make windows snappier , dealing with things like prefetch or superfetch etc . Another big thing is page file or aka virtual memory , set that up properly . Point is windows out of the box is crap for gaming .
It's probably something not set up right in your os most likely , if you just jump into your games after installing windows and not really taking the time to study how you can optimize it more to direct resources purely to games then yes you are going to have issues. It could also just be background programs running that you have installed conflicting with the game , anti viruses for example .
Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
Click Start, type regedit.exe in the Start Search box, and then press Enter.
Click Yes if the User Account Control dialog box is displayed.
Browse to the following folder:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
Note If the Layers key does not exist, right-click AppCompatFlags, click New, click Key, and then type Layers to create the key.
Create a new registry entry for the game. To do this, right-click Layers, click New, click String Value, type the full path of the game’s executable file in the box, and then press Enter.
Right-click the value, and then click Modify. In the Value data field, type NoDTToDITMouseBatch, and then press Enter.
Click OK to confirm the change. The registry key in Registry Editor should resemble the entry in the following screen shot.
A screen shot of the Register Editor window, highlighted the mygame.exe registry in the right pane under the Layers file
Open an elevated Command Prompt window. To do this, click Start, type cmd.exe in the Start Search box, right-click cmd.exe in the search results list, and then click Run as administrator.
Run the following command at an elevated command prompt:
Rundll32 apphelp.dll,ShimFlushCache
i suggest to use this workaround for explorer.exe file (remember to search folder of explorer.exe)
(i don't know if windows 8.1 update has fixed this problem...)
i suggest also to use a low polling rate of mouse (125mhz), because some game can stutter when you move mouse (this can't happen with a 125mhz polling rate)
remember to use latest bios of motherboard
I have Win 8.1 and there is no issues on my end. Must be some configuration issue or something.