This game is poorly ported, I don't care what fanboys say, not one version of GTA to pc has been ported in a great way, every version of GTA on pc has major problems.
The only way to fix the stuttering is to buy newer parts for your pc in most cases.
This is a sad fact.
You have to have overwhelming computational power to achieve a high resolution high frame rate in this game to allow for the not so great coding.
GTA 5 requires a higher spec than what they recommend if you want to run it at max with no stuttering.
I know this because I started playing on my AMD 8 core 8150 @ 3.9ghtz with 8g 1800mhtz ram, and a 6990ati video card, that system is not that old, about 3 years, its a tower, imagine a 3 year old pc, just chop chop chop, so I updated to a brand new system, in fact I built two, an AMD one and an Intel one, the AMD is a 9590 cpu with and r9 290x and 16 g of system ram 990fx sabertooth mobo, , that brand new system still gets stutter in the middle of the city, very disappointing.
The Intel system I have just built is an 8core cpu 5960x with an GTX990 NVidia, and an x99pro mobo with 16g ram.
This system plays GTA 5 lovely, but this system cost me 2800$ in parts [in Australia] .
I have spent a lot on pc's this year, and I know for a fact that GTA 5 could have been ported better.
The intel cpu doesn't suffer from bottlenecking like the brand new 9590 from AMD does.
I tried to build a cheap system to play this game, what a mistake that was, the AMD system cost about 1800$ the Intel 2800$ , it is an investment for the future and now my little girl is really happy she scored a new AMD system, but I did all of this just to play GTA 5 smooth.
I finally achieved that, but I hate to say, if you don't have really powerful video and cpu and fast ram, your going to get GTA5 stutter.
One thing I would like to say is, why is everyone so hostile on this forum ?
We are here to try and better the game for everyone.
Bragging you get 2 million fps on a crappy system doesn't help anyone.
And in rare cases this might be true. Rare.
This is just my opinion, there is no need to get nasty about it, take it with a pinch of salt.
I hope people reading this think about there system specs before buying GTA5, because a laggy game is just a huge letdown especially when you are paying 70$ plus for the game.
The game is worth 70 plus$ if it runs properly.
Make sure your system is powerful or you are running on lowest setting and could still get stutter as well.
That's as honest as I can be about GTA5.