Prior to Windows 10, you could do "Win+R", calc, enter and immediately start typing numbers because the calculator app launched instantly. They have also managed to add lag to the most basic calculator as well.
Normally something like this should be ended with a </sarcasm> tag but I'm fairly sure this is soon to be - if not already - more fact than fiction.
The solution? Ditch Windows. The pot is boiling, the frog has long since passed so bury it and move to greener pastures (no, not those used in the XP background). There is a Linux waiting for you, somewhere - take your pick and run with it.
I’ve recently installed Win11 on my new computer, and immediately discovered Microsoft decided to implement keyboard lag in that version. Luckily, that “animation effects” checkbox did the trick for me.