Check if your system meets the minimum requirements for the game. No troubleshooting will ever help you if you can't spend a little more on a better pc!

OS: x86 or x64 bit versions of Microsoft Windows XP/Vista/Win7
Processor: AMD/Intel single or dual-core processor running at 2.2GHz (Intel Pentium D or AMD Athlon 64 x2 are probably the lowest CPU architectures recommended)
Memory: 1024MB for MS Windows XP and 1536MB for MS Windows Vista/Win7
Graphics: ATI/nVidia graphic card with at least 256MB of dedicated VRAM and with at least DirectX 9.0c and Shader Model 4.0 support. ATI Radeon HD 3600 and NVIDIA Geforce 8600 are minimum required graphic cards. The game also works on the latest generation of Intel HD 3000 IGPs and AMD 6500 series IGPs.
DirectX®: 9.0c
Hard Drive: 300 MB HD space

Also update your video card drivers. You can do this on Steam client from the Steam menu above.

If you're still experiencing slowdowns, lowering the resolution is your best bet. To do this, open the game, then go to "Help & Options" -> "Resolution" and set it to the lowest one available, as shown on the screenshot below:


If even after setting to the lowest resolution you cant notice any significant changes, try the steps on the next section.

• Right-click the game from list and click Properties.
  
  
  
• On the Local Files tab, click "Browse Local Files".
  
  
  
• Find BangBangRacing.exe, then right-click on it and click Properties
  
  
  
• On Compatibility tab, make sure "Run in 640x480 screen" is checked
  (which is not on the image below).
  
  
  
• Play the game!
  

• Right-click the game and click "Delete Local Content".
  
  
  
• Confirm by clicking "Delete".
  
  
  
• Read a book!