I “live in Emacs”, like most of us (atleast at work). It has been getting slower release on release, async support doesn’t seem to have been picked up by most packages and native-comp has made it more brittle.
Over this time, we moved from running the OS on hardware to running in VMs, so fractional slowdown was expected. But what I have is a few X slower Emacs. I had never seen Emacs take a minute to indent a few thousand lines, for example. Maybe some modes have slower code.
To be fair, Emacs handles large files better than Vim. But yes, Emacs is slower on typical tasks, to the extent that an Electron app like VSCode can feel more responsive. Some slowness could be acceptable due to Emacs’ flexibility, but getting slower over time messes up the experience.