Code for avoiding calling NVM, which slows down the shell by a lot

nvm_bypass.sh

export NVM_DIR="$HOME/.nvm"
export NVM_DEFAULT_VERSION=$(cat $NVM_DIR/alias/default)
export PATH="$NVM_DIR/versions/node/$NVM_DEFAULT_VERSION/bin:$PATH"
export MANPATH="$NVM_DIR/versions/node/$NVM_DEFAULT_VERSION/share/man:$MANPATH"
export NODE_PATH="$NVM_DIR/versions/node/$NVM_DEFAULT_VERSION/lib/node_modules"

function find-up () {

  local look=${PWD%/}

  while [[ -n $look ]]; do
    [[ -e $look/$1 ]] && {
      printf '%s\n' "$look"
      return 0
    }
    look=${look%/*}
  done

  [[ -e /$1 ]] && {
    echo /
    return 0
  }

  return 1

}

function nvm () {
  . "$NVM_DIR/nvm.sh" --no-use
  nvm $@
}

function load-nvmrc () {
  local nvmrc_path="$(find-up .nvmrc)"
  if [ -n "$nvmrc_path" ]; then
    local current_version="$(node --version)"
    local nvmrc_version="$(cat $nvmrc_path/.nvmrc)"
    if [ "$nvmrc_version" != "$current_version" ]; then
      nvm use $nvmrc_version
    fi
  fi
}

add-zsh-hook chpwd load-nvmrc
load-nvmrc