La noire has become jittery PLEASE HELP

[CØLE]

Sorry if there is already a thread about this, but i could not find any.
In the last few weeks, i have noticed la noire has gotten jumpy, poor frame rate, and some frames are not fully syncing.
So far i have tried:
-putting the graphics all to the lowest settings, no change at all (my normal graphics settings are max on everything, apart from SSAO off)
-turning on SSAO, this helped slightly, but still moving the camera is very sudden, jittery and low FPS
-updated my graphics card to the latest driver, no change
-contacted rockstar for help, no help and no surprise there
-my graphics settings havent altered since i got the game about a year ago.

my pc specs are:
Windows 8.1 Pro with Media Center 64-bit
NOVATECH LTD
System Model: MBB-43004A
BIOS: BIOS Date: 04/10/13 09:32:24 Ver: 04.06.05
Processor: AMD FX(tm)-4300 Quad-Core Processor (4 CPUs), ~4.3GHz
Memory: 16384MB RAM
DirectX Version: DirectX 11

NVIDIA GeForce GTX 760
GeForce GTX 760
DAC type: Integrated RAMDAC
Device Type: Full Device
Device Key: Enum\PCI\VEN_10DE&DEV_1187&SUBSYS_36151458&REV_A1
Display Memory: 8058 MB
Dedicated Memory: 4011 MB
Shared Memory: 4046 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)

Any help would be greatly appreciated as this is probably my favourite game and its so annoying with the current problems.

[Criminal_Commander]

I probably won't help, nor do I know if you have found a fix for this issue but I will attempt. Ok so you appear to exceed the recommended specs from I can see, and also you have the latest driver updates. Perhaps the latest patch is messing with the game performance? Have people with similar specs reported similar issues?

[Royksopp]

You should run the game in DirectX11 mode, i had the same problems, the game runs by default in DirectX9 and for some reason switching to DirectX11 solved the problem for me. Hope this helps.

[marianne~]

@ Jack...thanks for the tip...I installed the update as required and have been having the same problems as the OP.

[Ruse]

Type -str into the launch options.

[CØLE]

thanks its seeems top have fixed itself now and its was only like that Barbara Lapenti's boarding house anyway, but i went back to there and its fine now. Thyanks anyway (I was already running DX 11