asdf is nice except is uses shims. They are pretty slow. If you offten run script as part of your prompt for example, it gets noticable pretty quickly.
Have you seen a difference yourself, and if so, could it have been from the overhead of loading gems instead?
I also know that Sam Saffron has mentioned the shim latency a bit before as well with other tools.
> We stopped benching on rbenv based systems, everyone moved to chruby or rvm cause the shims rbenv adds introduce significant delays on boot.
https://discuss.rubyonrails.org/t/why-is-rails-boot-so-slow-...