1) The game booster by razer is basically a copy of the game booster by iobit however the razer gamebooster created a bunch of problems on my computer including stalling my startup (even when automatic start was disabled). The iobit version did not have these issues.
2) I run a bunch of things that I like to close when I'm gaming, XAMPP, google drive sync, dropbox, bittorent, etc--basically anything that connects to the internet. The MOST critical is windows update! Windows update can bog your system down into the mud when you're trying to frag those noobs. And if you're set to update automatically, there's no warning that this running in the background, until it's ready to restart.
Sure you can close all these things individually, but it sure is nice to set a hotkey that does this work for you automatically.