Earlier quoted context omitted.
I use Spacemacs for Elixir programming and honestly, Emacs is slow, I would often type commands and then wait for it to complete. I think some reboot like Neovim did for Vim, could be beneficial as it is awesome editor, but it is just too slow to start and slow to use. It might be that Spacemacs layer is adding additional complexity, and maybe going through Helm is the issue, I don't know, just it does take quite a b…
I run on an eight year old Thinkpad. I run my own config now, but used Spacemacs for quite some time. I've never had problems with speed. I didn't use it with Elixir though. Perhaps try disabling your layers one at a time to see where the problem is.
Helm is super helpful, so most likely I will disable it and see how it goes.