Same issue here and I have two different controllers. XBOX (beat up pretty bad) and PS5 (like new). The XBOX controller is the most stable, and I enjoy it the most for games like Super smash, but also has more input lag.

The PS5 controller is less stable, but the track pad as my mouse is really cool. I use this controller for Microsoft Flight Sim because DPAD is in a much more preferable place for adjusting flaps and landing gears. This controller has almost zero lag, when it wants to work.

As for the HDMI cable: Ive noticed it makes a HUGE difference. I grabbed one off my old WiiU and the lag was atrocious. Switched it to the one the PS5 came with and it worked great. Ive been reading about upgraded fiber HDMI cords, but they’re a little pricey. If I was uber competitive, it might be a must have though. Ads say 20% reduction in lag.

Does anyone own one of these fiber HDMI cords and can confirm?

The steamdeck is not perfect. Takes a lot of optimization, or trying different routes to the play the games you want. Example: I am a Microsoft flight sim geek. Very very demanding game as far as cpu gpu. I first tried it on Win11. It worked okay, but very glitchy. Moved it to steamOS - much more stable but doesnt look as good. Not sure why that is.

I hear starfield SteamOS works ok so long as you’re not in cities.

Dead by daylight, i thought was a steam verified game? Can anyone else confirm?

Might want to try and reinstall. Maybe a third party install happened and you did not know it. These can crash the game pretty hard.

I have -fastlaunch and proton experimental. Running at medium graphics 25-35fps. No problems.

Custom settings for my preference is everything on low with clouds on high. This seems to give me the best feel at 30fps always.

Yea. Unit is glitchy for offline gameplay. I can’t get most SteamOS games to launch while offline. Probably needs certifications for activations? I travel A LOT, see this error A LOT. If my flight doesn’t have wifi (super rare), my work around has been to launch my game on airport wifi while at the gate (usually microsoft flight sim), load completely in, then throw it into sleep mode. When I bring it out of sleep mode, its already launched. I have no issues until I want to switch games. In that case, Yuzu. No puns intended.