i find also a post in this forum for the indentical problem...
https://community.stadia.com/t5/Stadia-on-Chrome/Why-blurry/m-p/20371#M1101
obviously I'm talking about when I play on PC ... because on chromecast TV the problem is much less noticeable.
Hey interesting, I thought it was just me. I wonder why chromecast ultra makes it less so.
I think that is given by technology. as it is built and for how big it is, you can notice less the blur effect that maybe even consoles have, unlike a PC monitor. but it's just a guess .. fact is that on PC it is a bit annoying and damages the game experience of Stadia.