Recently, I too tried making the switch from vim to Emacs via the Spacemacs route. The effort didn't last long. I found that Spacemacs, without installing any extra "layers" than what comes out of the box, consumes too much RAM. Over 1GB of it. Don't know if this was expected or if it was something specific to just my machine.
May I advise to give a try to Doom instead? It has less ambitious objectives [1] and feels much snappier while providing a similar experience (vim-like, out of the box)
Also, if you enjoy the experience provided by emacs + evil, giving a try to the native compilation branch of emacs 28 gives noticeable improvement in terms of speed.