Whenever I run into another person in the game it gets really laggy and cars start blinking in and out of existence, I have tried joining multiple games and the problem persists. I obviously thought it was my internet connection but I have played killzone and call of duty multiplayer and it's fine, has anyone else experienced these problems?

I have this game on PS4, have never seen those problems, though.

Might not hurt to reinstall the game. Doesn't sound like a HDD issue since the other games you mention do work.

@spookytapes: Rebooting my router seemed to do the trick, would you mind doing me a favour and checking what the install size is for need for speed on your ps4 please? because it says it's 17 gigs on mine but the back of the box says it's 25 gig minimum so I'm a little confused, thanks.

@pompouspizza: Mine says 16GB when I hit Options > Information on the NFS tile.