This is one lousy article. CPU doesn't get utilized enough? On my 8 core Ryzen 2700x it's utilizing all 16 threads. On AJs monstrous 12 core/24thread system it also used ALL 24 threads by 50% as he showed in a later video. Which engine or game so far actually supports that many threads so far and utilizes 8+ core CPUs this efficiently???

Honestly dude it's probably your graphics card getting too hot.

The 3090s are notorious for having problems with their RAM because they added RAM to both sides of the PCB and only cooled one of them. So you have part of your RAM chips on the back that are getting burning hot and maybe only passively cooled with a back plate that's if it has the metal back plate, while the others remains actively cooled and this difference creates performance problems. Because the system is reading the actively cooled ram but not the passively cooled ram and is therefore not adjusting the speed of the ram to keep it cool enough to operate within parameters that don't give errors. When the bad RAM on the back side sends a miscalculation it has to be recalculated by one of the other chips or dropped. You might also notice artifacting this is also a result of heat.

The reason you don't see this issue on Xbox and Playstation is because they have addressed all of their cooling issues...

"Not Optimized" does the guy who posted the topic even know what is Unreal Engine... Just because you can launch a scene within editor... Doesn't mean game is ready to play. It's an editor. It's not suppose to be optimized. It's nothing like fully built demo for a console they released few months ago.

epic can't even fix their sh*tty launcher for years yeah this will be a torture

Is the UE5 demo using Direct storage? That could be the main difference, consoles already have it and PC only just had it released.

this was not created for performance simply a >>>>>>>>>>TECH DEMO<<<<<<<< to show what unreal is capable graphically and nice bells and whistles like lumen/RT/Metahumans/Nanite and others.  video games will be optimized because that's what development is. This demo was made for consoles, they just brought it to PC to showcase. weird post you've got here.

The TECH DEMO  works fine for a tech demo with user freedom. The main issue I've seen as stuttering that did not come from the missing on pc feature "directstorage" was the physics engine and I'll be be honest the car damage in it looks pretty dope, The deno uses heavily new systems are really new in comparison. Nanite which even if it was mentioned it can remove the poly cap in scenes still has a hit on performance and it is a storage based approach to dynamic detail, lumen is ray tracing under the hood that uses a special type of geometry called signed distance fields, which based on count in range of the global illumination is so it slows down based on the objects in the scene, world partitioner a new open world system that I can't give too much details but all 3 are really reliant on getting the mesh data out from an ssd in speed currently too slow to work properly on pc. The issue with chaos is that having a physics based system to work in all the new directions they've went with is complicated and will take a fair bit of time. The other issue people don't probably think is heavy are the npcs, they actually have strand based hair not hair card which is cheaper but gives less physics to the hair and is harder to make hair that looks good, which are in their lowest lod, so that hits performance like a beast on the gpu

So they made a demo for consoles and surprise, it's optimized for consoles! Did it maybe occur to them at any point that this was a bit stupid of a worry? They benchmark UE5 using various projects, including Fortnite which is multi-platform. There is no problem to be seen.

That pickup truck has a 1000 speed automatic?

So .. you are whining your opinion on the experience someone had playing something on PC that was meant for consoles ?? quite reasonable ...

I wonder if using an RDNA 2 GPU + Ryzen might help since it's very similar to the console architecture

yup, it's stuttering sooooooo bad. i am worried how next gen games might perform in the future.