If you're looking for something simpler, with a sane out-of-the-box config, consider OpenBSD's cwm(1) -- the calm window manager. A portable version for Linux/BSD is available at https://github.com/leahneukirchen/cwm
I am generally looking for a lighter Window Manager based on wm2 [1] [2]... I even began writing one myself as I got tired of the normal options being really heavy. Currently working on modernizing it for touch/mouse dual input (no mode switching). FYI, the last shipped wm2 has tonnes of performance bugs I have been slowly working through.
[1] www.all-day-breakfast.com/wm2/
That kind of confused me when I saw the article title -like, why go back to FVWM when there's CWM right there?