“Temporary Reload Pattern” doesn’t load from disk, but only from RAM. That’s why it is so fast.
To illustrate this behaviour:
- Make a change to a pattern
- Switch to another pattern and back to first one
- Try “Temporary Reload Pattern”
You will see the pattern won’t change back to it’s state on disk. You need to reload the project to get it back.
(at least the AR and A4 behave this way and I think Digitakt and Digitone, too)
Timewise “Reload all Patterns” will almost take the same time as “Reload Project”, because the main chunk of data in a project is pattern data.
Update (from the Digitone manual):
The TEMPORARY SAVE PATTERN and TEMPORARY RELOAD PATTERN commands are great when improvising live. Any changes made to the active pattern, like adding bass line notes or using CONTROL ALL, can immediately be undone. The temporary saves and reloads do not affect the pattern in a permanent way.