Problem with Splinter Cell Conviction
Solution 1:
To fix resolution, go to:
C:\ProgramData\Ubisoft\Conviction open the ConvictionUserPC.ini and find and change
FullscreenViewportX= change (width like 1360) FullscreenViewportY= change (height like 768)
As for the second problem , try to run the game in windowed mode, if that dosen't work out, then open taskmanager and put splinter.exe on high priority.
Note : Make sure you run as Administrator.