I don't have any large files to try , point me to one and I will slice and dice it all day long to see how it works.
(I am mostly a hardcore excel on windows on a dramatically crappy set up guy - I will bring my work machines to the ground. I don't use it on Mac because I don't do it at home, and I don't like the subtle differences. But I have it and I can try it given a file)
I am the guy who when I was five, my dad told me "lotus 123 is the only program you need, see you can type in it who needs a word processor" - and 40 years later I am like "who needs a database, I am straight up doing this wrong just because I can
"
That said - do you get it from the MS site or the App Store for the M1 compatible?
(I think I use the Mac store versions now on my other Macs?)
I have a base model M1 Mac mini.
I can also compare to my i7 64gb Mac mini.