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Root7306221dLinux? Have X make a new virtual screen.
A vnc server maybe? Chromecast is of limited usefulness because it's so locked down and underpowered (old ones can't even always play 720p youtube videos any more without horrible stutter), and the new ones are android TVs, which there are many other alternatives of.
C0D46264220dWhat's the other device?
Anything wifi based will be slow as shit and not worth the effort, although chromecasts do adjust for the lag.
Plex as @heyheni said can help but that depends on what's being streamed, (pre-recorded vs live stream)
Casting to a tablet, there's apps for that, but generally the response and lag is painful.
More details needed really to understand what your trying to achieve and why hardware you have lying around to do it with.
So let me get this right.
Your trying to stream from your laptop, to your Rpi, and I'm assuming your Rpi is connected to a tv/monitor?
If this is the case, you might be able to get spacedesk to work for you.
Use the Rpi with the browser viewer.
And the server on your laptop.
Sharing a whole screen probably won't give a decent performance for video playback unless you can accept low resolution. I would expect there to be delay, tearing, skipped frames, and/or compression artifacts. I would like to be proven wrong though.
If video playback is all you want, it's better to have something where the host machine doesn't do rendering, so no extended display.
So win+P then selecting extended allows me to pretend there's a second screen and I can stream through VLC but I can't get it to stream only the second screen