Try:*Try to set your graphics to the lowest.* Go to C:\Riot Games\League of Legends\Config and open game.cfg with notepad.[Performance]ShadowsEnabled=1EnableHUDAnimations=0PerPixelPointLighting=1EnableParticleOptimizations=0BudgetOverdrawAverage=10BudgetSkinnedVertexCount=200000BudgetSkinnedDrawCallCount=100BudgetTextureUsage=150000BudgetVertexCount=500000BudgetTriangleCount=300000BudgetDrawCallCount=1000EnableGrassSwaying=1EnableFXAA=0AdvancedShader=0FrameCapType=0 Set FrameCapType to 0EffectsQuality=1GammaEnabled=1Full3DModeEnabled=0EnvironmentQuality=2CharacterQuality=2AutoPerformanceSettings=0ShadowQuality=1GraphicsSlider=-1Could you tell me your ping? (ctrl+F) When it occurs.Could you check your heat of your computer.To check your heat of your PC use speedfan made it work on windows 8.0 with GTX765M and HD4600 combo by creating a new shortcut on my desktop with this path.C:\Windows\explorer.exe shell:::{78F3955E-3B90-4184-BD14-5397C15F1EFC}Any name you like.Then right clicking the shortcut and selecting run with graphics processor and selecting the nvidia option.Then run as normal and mine uses the nvidia card.