Does "lighter" necessarily mean "faster" on newer hardware?

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http://crunchbanglinux.org – Before Crunchbang, I used Debian Testing with Mate and liked it a lot. Everything I wanted to do was done with optimal performance, but the thought of something out there being "lighter" and possibly "faster" kept nagging me. I completely disregarded the "if you're happy with what you have, don't switch" philosophy and installed Crunchbang. Crunchbang was initially everything I wanted and more, until I started playing 3D games. My FPS have dropped significantly since I moved over from Debian Testing. I started disabling things that I thought may be causi (HowTos)