I treat warming up, and practicing in shops as. 2different things .
I used to warm up at home with scales for the first half hour , then learn other stuff.
Other types of warming up, meant improving my finger dexterity.
As for playing in shops , I used to be one of those irritating /naive people who wanted to try and impress . Trying to slap when you can't , is never good. Tapping etc. Having said that, I was learning new stuff and was getting carried away.
If I was playing in a shop now, I'd just take my time and play a few things I know.