How I debugged my slow bash startup

._example output

# Start a new shell
... startup: 31
... git-completion: 113
... git-prompt: 41
... exports: 47
... rbenv: 216
... other scripts: 41
~$

.bash_profile

print_timing(){
  func_start=$1
  func_label=$2
  # func_end=$(date +%s%3N)
  func_end=$(python -c 'from time import time; print int(round(time() * 1000))')
  echo ... $func_label: $(( func_end-func_start ))
  start=$func_end
}

start=$(python -c 'from time import time; print int(round(time() * 1000))')
print_timing $start "startup"

# some chunk of stuff

print_timing $start "first chunk"

# initialize my PS1 which got slow and hairy

print_timing $start "ps1"

# rbenv is pretty slow

print_timing $start "rbenv"

# load nvm because holy cow it's slow

print_timing $start "nvm"

# other scripts last
[[ -f ~/.bash_profile.local ]] && source ~/.bash_profile.local
[[ -f ~/.bash_aliases ]] && source ~/.bash_aliases
[[ -f ~/.bashrc ]] && source ~/.bashrc

print_timing $start "other scripts"