title: Is there a way to speed up the library loading in R?
body: <p>I have a Rscript that will load <code>ggplot2</code> in its first line.</p>
  
  <p>Though loading a library doesn't take much time, as this script may be executed in command line for millions of times so the speed is really important for me.</p>
  
  <p>Is there a way to speed up this loading process?</p>