For me, "Freeze" = Temporary (during composing & tracking)
and "Commit", = Finalization (during and after mixing).
For example, I may temporarily freeze a set of instrument plugins after establishing some basic tracking accompaniment before recording audio tracks.
This is not always necessary on my setup, but sometimes really active cymbal parts in the drum plugin I use can cause CPU spikes when recording guitar through an amp/fx plugin at a lower buffer size.
Then if I want to modify a drum pattern, I can momentarily unfreeze the track.
I have a modest setup so it's just an efficiency method when needed.
It's mainly when the cymbals are really active or if I want to load more layers and free memory for more multi-sampled/processed instrument tracks while recording.
When mixing, I commit in sections/sub-groups as they are established to open up processing power for the mix & master bus.
Or commit lightly processed tracks for stem export so that a more professional mixer can import the tracks and have their way with them!
This is just my approach at a hobbyist level.
More professional producers can provide more ideas as to their own logistics & foresight.
And their machines likely have way more processing power so they can do as they please~ with such ease~ with no need to freeze***
