For months I've been trying to get Forza Horizon 3 running at a playable frame-rate. However, after extremely extensive research over several months, I'm not sure that this is a problem with the game itself, and that perhaps there could be something wrong with my GPU or drivers.
 
I have an AMD FX 8320 Eight-Core CPU, 12GB DDR3 RAM, and an EVGA GTX 950 SC, but I can barely even run Forza Horizon 3 on low at 1024x768. CPU usage is always 30-40% in the game, but GPU usage is always 99% at even the lowest settings. If I do this (resulting in the game looking surprisingly ugly) I can almost get 30 FPS, although it's usually more around 25 FPS.
 
There are many videos on YouTube showing people playing the game with a GTX 950 and the same (or a similar) CPU. Lots of examples:  Many of the people in the videos are using medium-high settings and achieving very much playable frame-rates. Generally an absolute minimum of a solid 30 FPS in 1080p.
 
I have not found any evidence of other GTX 950 owners having their GPU usage at a steady 99%, and especially not with such low settings.
 
Someone recommended I do a clean driver install, following a guide that completely removes the previous drivers from Windows, and all traces of it. However, I've reinstalled Windows twice since I began troubleshooting this Problem at the end of September of 2016, so I'm not sure whether that's relevant at all.
 
If ANYONE has any ideas of what I could try, in order to get this working, or even if it has anything at all to do with my GPU, please let me know! I'm honestly considering getting a GTX 1060 with the primary reason being so that I can play this game. Yes, I do want to play it that badly.

A 950 is an 'entry' level gpu, like what is on cpu's.
Its not very good.
Also, the AMD cpu's are getting long in the tooth for new games (I know, I have an 8350 and a 770, and its ok, but not great. And you have even less of a cpu and video card).
If you want to game, the 960 would have been much better, and an x70 would be 3x better than an x60.

I'm not sure if you've figured something out or not, but have you checked your settings in the Nvidia control panel?
 
Make sure your power management mode is set to adaptive or prefer maximum performance for Forza, it defaults to optimal power, which is a power saving mode that will harm performance. I've been caught off guard by it in the past (primarily by the driver update that introduced it).
 

Dave3d
A 950 is an 'entry' level gpu, like what is on cpu's.
Its not very good.
Also, the AMD cpu's are getting long in the tooth for new games (I know, I have an 8350 and a 770, and its ok, but not great. And you have even less of a cpu and video card).
If you want to game, the 960 would have been much better, and an x70 would be 3x better than an x60.

I wouldn't call it entry level, I guess technically it's the lowest in this series, but it could still be considered lower mid level. They just didn't bother with a 940 or 930 (which would be low / entry level) afaik.
 
Either way, it's a heck of a lot better than integrated, and I get good performance out of mine (better than current consoles for the most part).