Article written by someone who experienced Emacs as being slow and janky. Yet Emacs is one of the fastest software I use. Now I am definitely an Emacs power user: I started using the native-compilation branch as soon as it came out, I don't mind building from the source the latest version available when I see something that picks my interest, I've got about 3 000 lines of custom elisp code, I'll be using other really fast stuff, like burntsushi's amazing
ripgrep, directly from Emacs,
fzf too, etc.
I don't understand the criticism about Cider: I use it daily.
Emacs 29 with libjansson and native-compilation is plenty fast.
And most of all: apparently every single new version of Emacs not only runs but also compiles faster. And this is coupled with my computers which only gets faster too.
At the moment I'm running Emacs 29 on a AMD 3700X, soon to be replaced with a 7700 or 7700X. That's going to be yet another performance gain.
Most software only get slower and slower with each release (I was already using IntelliJ IDEA back when it was a version 4 and already bloated, since then it's been downhill perf-wise): Emacs, on the contrary, always keeps getting faster.
And the goodies added to Emacs lately are just insane: native-compilation, LSP support, tree-sitter (it's just been included in Emacs and it should bring yet another round of crazy speedups)...