Earlier quoted context omitted.
I've also noticed that it's slow on Macs for some reason too. The same set of plugins don't seem to cause a slowdown on Linux.
That's very strange, it seems to be the case for both Vim and Neovim, and it doesn't depend on the terminal or shell I'm using. Is it just something inherent in the Mac environment then? I was always left scratching my head over the number of plug-ins people used, wondering how the program was even functional for them.
I'm no Vim or Mac OS poweruser though - I've just kinda put up with or avoided it. Sorry I couldn't really offer much beyond confirmation :)