Question Forza Horizon 4 massive stuttering

[LucyDrop]

So I have this weird issue with Forza Horizon 4. I noticed that after like 40 minutes of playing it starts to slow down more and more and after 2 hours it's basically unplayable
View: https://www.reddit.com/r/xboxone/comments/bfoukd/forza_horizon_4_slowing_down_randomly_while/

It's something like this but lasts shorter and it's much more often, I cannot provide video clip because of my upload speed.
I have Ryzen 5 2600 in pair with GTX 1660 Super and 16GB of 3200 MHz ram which is running at 2933 because my system keeps crashing at 3200 MHz. Game is on SSD, and I'm on the Ultimate power plan. I also noticed that if I lock my fps to 72 instead of 144 ingame, drops are less noticeable but it's still unplayable.
FULL SYSTEM SPECS:
Ryzen 5 2600
Asrock B450M Steel Legend
Gskill Aegis 2x8 DDR4 3200 MHz 16-18-18-38 at 1.35v
Gigabyte GTX 1660 Super OC 6 GB
WD Green 240 GB M.2 SSD
WD Blue 1 TB HDD
screenshot of HWmontor while that was happening:

https://imgur.com/zM2QZvC

View: https://imgur.com/zM2QZvC

 

[Lutfij]

When posting a thread of troubleshooting nature, you're advised to include your full system's specs. Please include/list your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
OS:

If you're on X.M.P, you should try manually inputting the ram's frequency, timings and voltage in BIOS and see if that changes your experience.

 

[LucyDrop]

When posting a thread of troubleshooting nature, you're advised to include your full system's specs. Please include/list your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
OS:

If you're on X.M.P, you should try manually inputting the ram's frequency, timings and voltage in BIOS and see if that changes your experience.

I edited full sys specs but I don't think that ram is a problem because that slowdown only happens in FH4 and not in any other game that I play