I've always used Afterburner for FPS monitoring in games, but recently I'd been noticing game reviews featuring a unrecognizable in-game performance overlay, but I couldn't figure out what it was. Fast forward and I tracked it down to "FPS Monitor" and I thought it's worthy of a heads-up here. I've used it a couple days and it's already far more insightful than the metrics available from Afterburner, and it's way more customizable -- FPS, frametime, network traffic, SSD drive temp, basically anything. It comes with a layout editor. Enjoy.