Lower the graphics settings including settings like anti aliasing,anisotropic filtering,etc, in Catalyst control center(you mentioned that u use a radeon card).
When it comes to your video card and Need for Speed Heat, racers will want at least a Radeon RX 480 or a GeForce GTX 1060 to really play the game at its full potential. If you want to play Need for Speed Heat on PC, then you will need a computer that at least passes the minimum system requirements test. NEED FOR SPEED HEAT – PC SYSTEM REQUIREMENTS You’ll need Windows 10, a graphics card like a Radeon HD 7970, GeForce GTX 760, or equivalent, 8GB of RAM, and a Core i5-3570 or equivalent processor to meet the minimum requirements. Need For Speed Heat needs a graphics card thats at least as powerful as a GeForce GTX 760/Radeon R9 280X paired with FX-6350/Core i5-3570 3.4GHz CPU to match the min specs. The game engine for Need For Speed Heat is Frostbite. Can I play NFS heat without graphics card? Games that run on 4GB rams are the ones that were released before 2013.
Jokes apart, you need a minimum of 6GB ram to run it.
Even if you do you will suffer lag and then you will have a real ‘Need For Speedy upgrade of my system’ situation. Yes, we’ve reached a stage in AAA gaming where an offline single-player mode is rare enough it can be described as a positive. Need for Speed Payback is an open-world racing game with lots of different types of races, and an offline single-player campaign. is creating the 23rd title to join the Need for Speed (NFS) franchise and it’s set to be the best yet. New Need for Speed: Heat will have more cars, more customisation, and more challenges.