Switching to Picom (Compton) on the MATE desktop

You may have read some convoluted (and outdated—Compton was abandoned in 2017) tutorials on the matter like MakeTechEasier's, or perused the excellent Arch Wiki article's page on it to some despair, but if you are just a layperson who installed the MATE desktop for e.g. Ubuntu 20.04 (Fossa) and wants a slightly faster (i.e. GPU-accelerated) environment, there is a workaround that doesn't take too long to set up: …