bash: improve startup time

bash/.bash_profile

@@ -2,10 +2,8 @@ if [ -s ~/.bashrc ]; then
     source ~/.bashrc;
 fi
 
-eval "$(rbenv init -)"
-export PATH="/usr/local/sbin:$PATH"
+eval "$(rbenv init - --no-rehash)"
+(rbenv rehash &) 2> /dev/null
 
-export PATH="$HOME/.cargo/bin:$PATH"
-
-export NVM_DIR="$HOME/.nvm"
+# export NVM_DIR="$HOME/.nvm"
 # [ -s "/usr/local/opt/nvm/nvm.sh" ] && . "/usr/local/opt/nvm/nvm.sh"

bash/.bashrc

@@ -105,13 +105,10 @@ alias fkill='fzf_kill'
 if [ -x /usr/local/bin/brew ]; then
     export PATH=/usr/local/bin:/usr/local/sbin:$PATH
     export MANPATH=/usr/local/share/man:$MANPATH
-
-    # bash_completion if installed
-    if [ -f `brew --prefix`/etc/bash_completion.d ]; then
-        . `brew --prefix`/etc/bash_completion.d
-    fi
 fi
 
+export PATH="$HOME/.cargo/bin:$PATH"
+
 __git_ps1() { :;}
 if [ -e ~/.git-prompt.sh ]; then
   source ~/.git-prompt.sh