Weird question, but does High Sierra enforce slower more careful typing of passwords at login?

So, everything is up and running again since I finished a very difficult and pain in the ass process of updating from El Capitan to High Sierra.

So far everything all seems to work just fine, there's just one bizarre thing that's too insignificant to really complain about but just so odd. I used to be able to, on waking the machine from sleep, very rapidly type my password out and hit return to log back in.

Now, it always tells me it's the wrong password UNLESS, I very carefully enter each character and really deliberately and slowly hold shift for capitalisations and even wait a half second before hitting return. The number of characters appearing as circles in the text box appears to be correct, so I assume the issue is occurring during some of the capitalisation of characters, but WTF? It's such a weird thing to change. Is this a High Sierra thing, or a my specific rig thing? Typing everything else works just fine InCluDiNg CapitAlisAtionS, this really just occurs at login.