Slow startup performance on nvm and rvm

[patricktruebe]

Hey Lars,

thank you very much for sharing your great set of dotfiles. I am experiencing a very slow start with nvm and rvm bash-files enabled in runcom/.bash_profile. It takes nearly 5 seconds to launch a new shell. Disabling both modules reduces startup time to below 1 second.

Do you see similar results with your setup?

Patrick

[webpro]

Thanks, @patricktruebe! Yes, it's pretty much the same for me: much faster without the rvm and nvm scripts. I'm very interested in speeding it up, but I don't have the time right now to dive into this.

[webpro]

For me, rvm isn't slow, it's nvm (also see nvm-sh/nvm#1277).

I got it down from 2.9s to 2.2s by hard-coding the nvm path in system/.nvm:

# before:
source $(brew --prefix nvm)/nvm.sh

# after:
source /usr/local/opt/nvm/nvm.sh

Without this line (ie. without nvm), boot time is only 1.4s for me. I'm benchmarking like this:

lars@Blade ~ ❯ time . .dotfiles/runcom/.bash_profile 

real	0m1.408s
user	0m0.865s
sys	0m0.369s

[webpro]

Hi @patricktruebe, I've done some work in my dotfiles. Regarding the performance issue, there were two calls to brew --prefix, which I'm now caching (in .cache.sh). This cache file could be used for more expensive calls, if we come across them.

If you want to try it, you can run the install.sh script again, or just the changes in brew.sh and npm.sh from 946ce7f.

I'm going to close this issue now, but feel free to discuss (and I'll be happy to re-open).