I'm on Android. I use an app called Pushbullet, which mirrors notifications but also enables text and file sharing between all your devices. Sharing is instant. I also enable "open immediately on browser", meaning if I send a link from my phone to my computer browser then it'll automatically open a new tab with that link. It's pretty neat, it's really two or three taps away from any web browser tab on my mobile (open menu, hit Pushbullet shortcut; or open menu, open sharing menu, push to all devices).
I used PushBullet once and send a pornhub link to all my devices which auto played. When I say Autoplayed I mean it started to play on my work machine and I was working from home.
Never rode my bicycle quicker (public transport sucked). Fortunately my computer was on mute but still had to confess to watching certain content on a work machine to my boss. Nothing came of it but all the same.
Be careful. I even posted on r/TIFU at the time.
I use the "send tab to another device" feature a lot, and it's true that sometimes it isn't fast enough to be considered real-time. Sometimes tabs appear instantly, sometimes they don't appear for minutes, and sometimes restarting the browser triggers tab reception. In any case, it's already an awesome feature.
I've wondered how send could be so slow but maybe something in my setup is just killing it. More than anything though, I would love an easy way to access my phone's sharing options from my laptop (perhaps an addon button that shows a list of app intents that can receive a url/page).
This is one thing I'm hoping to hack at when I get my Librem.