That's always the excuse for sloppy programming: "Things are bigger now". The truth is: CPU and RAM progressed at a speed not just a bit but much faster than real estate (pixels) growth and refresh rate.
Anyways... IceWM used to be my window manager of choice but since many years now I'm a happy camper with The Awesome WM (a tiling WM, but it can of course also be used in floating mode: one of my virtual desktop is always in "floating" mode).
awesome is great. one of the few tiling managers that actually has the grace built in to deal with windows that really can't be tiled sanely.
> The truth is: CPU and RAM progressed at a speed not just a bit but much faster than real estate (pixels) growth and refresh rate.
Back of the envelope, for a 4k HDR ultra wide you'd need tens of gigabytes per second of memory bandwidth alone to do rendering all on the CPU.
There is a reason we offloaded to the GPU.