Windows 10 taskbar bug is reportedly slowing down some PCs | TechRadar
This menu is there for added convenience, of course, but as Dawson points out, it's not so convenient or streamlined if you have to wait a while for the options to appear.
Dawson observes that he reported a glitch whereby there was around a 500ms delay with the taskbar last year, and that this was fixed, but then adds: "However, closer analysis shows that there still remains a 200-250 ms delay from the moment that the mouse button is released until the menu appears.