i mean the demo runs clean in the browser but the full version of the original game likes to get low fps.
The only bearable settings is windowed mode then it works a little better but still gets slow sometimes.

Maybe it's the fault of this laptop which is
Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz 2.60 GHz
8gb ram
AMD Radeon HD 7650M 2gb
windows 10 home 21H2 64 bit

I don't know what kind of ram i have the pc was given to me.
Also is it important which browser i have installed for this game?
Because currently i only use Edge browser.

I have a similar problem with Ara fell which likes to get slow ingame on this laptop.
It also has a intel hd 4000 graphic inside but i changed my settings to default to the radeon one.
Don't think most of the ingame settings make a difference much.
Also windows is fully updated graphics i can't update anymore since it's the most recent version i think.
Also while i have installed directx 9.0c i have no idea if on win 10 there is any updates i can make for directx 10 and on since i am not knowledgable about that info

Does anyone experience the same problem in this game?

Well now that i have a new pc since october it doesn't lag at all except the Ku'lero dungeon where you have to beat several guardians in the same zone except on different platforms. It's the dlc part of the game.

My system now is intel i5 12400f, 16 gb ram ddr4, nvidia geforce rtx 4060 8gb vram and on a nvme m2 ssd.
Am on windows 11 24h2
Still managed to beat that area but why the lag there?

Guess one solution is posted here:
https://www.reddit.com/r/CrossCode/comments/lx3hyn/comment/gxmlsrz/?utm_source=share&utm_medium=web2x&context=3

Maybe it could be the CPU. Or the game is not optimized great in that area. I can't remember if I had any lag since I have beaten the game years ago

Yeah the game isn't optimized there, it happens when you use combat arts at level 2 and 3 and zooms in then it lags.
And somebody on steam said this area uses 20gb ram for some reason.
But even when the map was empty of enemies and you do a level 2 or 3 combat art it could lag.
Then i reloaded the game and went back and it didn't lag without enemies in that area when i used combat arts.
So pretty random.
Had pixel size at 3 though, somebody mentioned if i had pixel size of 1 in that area it would not lag.
Probably gonna beat the game today, as i just defeated the son of the beach fight.

Well i had a save so i tested it at pixel size 3 it lags and so does it at 2 and at pixel size 1 the lag isn't obvious.