Prehistoric climate change was sometimes much more sudden than anything we've experienced. See e.g.: https://en.wikipedia.org/wiki/Younger_Dryas

There are others.

The present has accepted this challenge. As Wiki states: "The scientific consensus is that severe AMOC weakening explains the climatic effects of the Younger Dryas." And with the news about AMOC weakening today, we could as well be off to quicker temperature swings (particularly in Europe) than we've seen the last decades that might well challenge the Younger Dryas.

"in the tropics, the cooling was spread out over several centuries" but "2–6 °C in Europe and up to 10 °C in Greenland, in a few decades. Cooling in Greenland was particularly rapid, taking place over just 3 years or less"

That's indeed a lot more extreme in a shorter amount of time, at least regionally. Feel like I should have known that! Thanks