Generally one has to "get the hang of the speed" of how quickly that F12 has to be hit.
Once that INSERT is held down, you have to play with "how fast can you go" with the double F12 press. Eventually you find the sweet spot, speed-wise.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
One does not discover new lands without consenting to lose sight of the shore for a very long time.
~ André Gide