Do you have the PC dongle?

Try sunshine and moonlight for streaming. Better quality and you can wake your PC through moonlight on the steamdeck.

But harder to setup though.

Any links to where to buy it?

I sometimes use a steamdeck out and about but most of the time I use it at home streaming my desktop using sunshine/moonlight. I don’t notice the lag, just enjoy the high quality visuals and extended battery. You can even use wake on lan to wake up your PC from moonlight on the steam deck.