What is macOS processing in the background as you type?

[Faize]

The longer you hold down a key for, the higher CPU usage gets - after 20 mins or so it uses up an entire core, and while I don't have the patience to do it for long enough to use up all cores, I have managed to get CPU usage up to ~400% just by continuing to hold down the key.

It's pretty obvious that macOS is somehow processing the increasingly long "word" on each keystroke, but what exactly is it doing?

 

[Sciuriware]

The longer you hold down a key for, the higher CPU usage gets - after 20 mins or so it uses up an entire core, and while I don't have the patience to do it for long enough to use up all cores, I have managed to get CPU usage up to ~400% just by continuing to hold down the key.

It's pretty obvious that macOS is somehow processing the increasingly long "word" on each keystroke, but what exactly is it doing?

Might be the AI trying to match your 'word' with anything it 'knows'.
;JOOP!

 

[Bigwaff]

The longer you hold down a key for, the higher CPU usage gets - after 20 mins or so it uses up an entire core, and while I don't have the patience to do it for long enough to use up all cores, I have managed to get CPU usage up to ~400% just by continuing to hold down the key.

It's pretty obvious that macOS is somehow processing the increasingly long "word" on each keystroke, but what exactly is it doing?

Specifically what process is utilizing up to ~400% CPU under this scenario? What is your Mac model and year? Bluetooth or wired keyboard? Etc.