minimized windows freeze in High Sierra

I have occasionally the same problem reported in a 2017 post with exactly the same title (verbatim: "When minimizing windows, they often freeze in an interesting to look at but annoying pattern in mid-minimization. This is particularly true of Mac Mail and to a lesser extent Firefox and Safari. Usually the the windows eventually unfreeze and continue their path to minimized state").

Quite annoying, even if not crucial - never had to restart any application or the computer. I suspect it has to do with the graphic card. Operating a Macbook Pro 2016 with touch bar (3.3 GHz Intel Core i7, 16 GB 2133 MHz LPDDR3, Intel Iris Graphics 550 1536 MB). Any idea of proposal for a solution?

Thanks!