[baq]

Numbers could be nice if it was fast. Unfortunately it’s dog slow. It’s good enough with the simplest formulas, but once you try to actually use it for anything, it becomes unbearable.

[alwillis]

Certainly Numbers 14.2 on a recent Mac isn't slow.

Not saying you're doing this but it's not uncommon for someone to say something is slow when it's a version from 10 years ago.