Game has a problem with microstutters, the 1% FPS dips to 15 FPS every second or so while Real-Time FPS shows aroun 90-100.

Setup:
Radeon 7900xt
Ryzen 3700x
32gb RAM
nvme SDD

it's either a driver problem or just something that was overlooked in game development.
GPU utils alternates between 100% and 80% continuously, exactly when the stutters happen. CPU utils always around 40%.
It is just unplayable for now.
Running it at 4k with or without FSR doesn't change much, with any kind of graphics preset (low, mid. high,...)

Any specific events when these happen?

My setup is

Radeon 7900XT
Ryzen 9 7900X
32GB RAM
NVME SSd

and I have yet to encounter such issues.

This game is insanely CPU heavy and your CPU is under par. Please check the recommended requirements for 1080p 30fps.

Stuttering is really annoying me in this game.
From boot up the game is playing fine, however if henry dies and I reload, stuttering happens constantly.
If i mount on a stolen horse and dismount then stuttering begins as well.

The only way I've found to stop this, is to restart my PC, but doing that everytime Henry dies or you mount then dismount a horse kills the enjoyment of the game 5 hrs and have to say will be waiting for the next patch, just not fun anymore.

The CPU is fine, i even put in a 5950x to check and the issues persist I also noticed that when I start the game up fresh there are very few stutters

Don't know if this will help with this but...

I started having some performance issues after a few dozen hours of playing, so I bumped the FPS limiter from 60 to 120 while tweaking the settings and I suddenly got way better perfomance, despite sitting at 45-50FPS with 60FPS limit, I got like 90-110FPS at 120FPS limit.

Yes, ok but that's not the same as microstutter, were you experiencing that before?

R9 5950X, 64 gb Ram, RTX 4070 Ti Super. I play in 4K, all settings Maksimum, DLSS balanced - no such issues at all.

I've done quite a few things to resolve the issue for me so here it goes.

1) I uninstalled and reinstalled the game - this made no change
2) Installed Mod to enable async compute (from nexus mods, called FPS boost) - this helped to lower the stutter effect but still noticeable.
3) From the reddit forums found the perk 'Local Hero' when activated caused stuttering (sound dumb but IDK any better), so I reset all my perks, it's important to mention at the time I didn't have the 'Local Hero' perk activated as I only progressed about 5 hrs in. But tried out of desperation anyway.
4) The actual fix - From reddit, this was crazy BTW, but the fact I was using a PS5 controller and wireless mouse were causing some sort of interference.
So I did the following, unplug the wireless dongle from my MBO, unplug the Bluetooth receiver from my MBO.
Use a wired mouse and wired controller, hey presto no more stutter, play tested for 2 hrs it was fine.
**IMPORTANT** - I really hate wires so my final solution was to move the mouse's wireless dongle and Bluetooth receiver so they were as far apart on the MBO as possible. Next I reduced the polling rate of the wireless mouse via logitech software to the minimum possible, then I turned on bluetooth then reconnected my PS5 controller.
After booting the game (clicking the play button in GOG), I immediately turn off the power switch on the back of the wireless, to be pedantic then play the game.
Played for 4 + hrs.
It runs buttery smooth now, Thank F*** for that.
**IMPORTANT ALSO** I have all of the above solutions activated in order and still use all of them together.
If you're in a similar niche circumstance then I hope this helps you too or at least diagnose what it is or isn't.
For me now that it is working well enough, I am going to disable updates till DLC release and create a copy of the game on another drive so any future updates won't F up this working version I have.