That sounds like there's something seriously wrong with your machine or network (either that or the 'corporate lockdown' joke isn't a joke...) I've found my M1 MBP much more responsive (especially under heavy load) than my Intel MBPs.
I also use IntelliJ and find the latest 2022.2.1 release to be positively snappy
Our monorepo is also enormous in regards to IntelliJ. I don't know why all the other UI elements lock up though, indeed I think the corporate lockdown problems are historically also what made the experience miserable on many windows machines that otherwise looked good on paper. Now that macs are showing up more in the corporate world, the red tape is catching up.
I also use IntelliJ and find the latest 2022.2.1 release to be positively snappy