Lots of comments on here about turning off the lid close behavior but, last time I tried that on Windows, a long time ago, because I was using vnc from my main desktop, the thing ran horribly slow because it did some other "power saving" junk on the video card. Is that still an issue?

I currently have 3 laptops opened all the way flat, and standing in a folder rack (because they take up an awkward amount of space open the normal way), that i remote into for various jobs. Can I close them these days without a major hit to basic performance? Of course i'd have to open them to turn them on anyway, so that'd be annoying.