The fragment part comes from KDE nor GNOME coming close to the efficiency of DWM and Windows Explorer.

DWM and Explorer have low-latency, good hardware-acceleration, and power efficiency down to a T. GNOME 44 isn't on-par. I haven't heard anyone ever compliment KDE in these regards recently and back when I last tried it when Plasma 5 was relatively new it also wasn't up-to-par.

More work should go towards making these GUI toolkits run as efficiently as possible, instead of re-inventing the wheel slowly while macOS and Windows continue going strong.