No way, every programmer knows the most efficient method of managing your UI is to unload everything needed to render it so each time someone wants to use it you have to read from disk and load that shit back, while you're in the middle of a game that is probably thrashing the disk at the same time.

Then when you hit shift tab and open the browser and it opens immediately, it's not because Steam kept that shit in memory so it could open quickly. I bet those smartypants programmers designed Steam so that it loads WebKit so it can run itself, and then they magically unload all of WebKit when you start a game, despite the fact that the entire Steam interface relies on WebKit and you can still have the Steam window open in another monitor and actively use it, like I do, while simultaneously playing the game. HOLY FUCKING BATSHIT ROBIN IS THAT A TABBED BROWSER INTERFACE? !DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN' ' '