Another (new) Emacs user here, I managed to reduce Emacs startup time to 0.6s - 0.5s on my garbage hardware. Some Emacs users have even manages to reduce the startup time to 0.3 - 0.2 seconds!
Also, launching Emacs in --daemon mode makes creating new frames instantanous and because of it you won't experience any form of lag when using Emacs!
Only if simplex-chat had better UI...