title: Building all of Boost in a few minutes
body: <p>Can anyone explain why following these instructions:</p>
  
  <p><a href="http://www.boost.org/doc/libs/1_59_0/more/getting_started/unix-variants.html#easy-build-and-install" rel="noreferrer">http://www.boost.org/doc/libs/1_59_0/more/getting_started/unix-variants.html#easy-build-and-install</a></p>
  
  <p>... it takes my decent machine 5 hours to build all of Boost, while <a href="https://github.com/zaphoyd/websocketpp/issues/475#issuecomment-154384120" rel="noreferrer">some folks</a> report doing the same in only 3 <em>minutes</em> ?</p>
  
  <p>Is there another way to build Boost than the one mentioned above that indeed goes pretty quickly (compared to several hours, at any rate).</p>
  
  <p>I am using the Clang compiler on Darwin (Mac) option. Not sure how relevant it is but I have 16 GB RAM and a recent SSD. The clock is 2.3 Ghz.</p>
  
  <p>Edit: I'm happy to report, based on the comments and answers, that using the <code>./b2 -j4 -d0</code> options, I got my compilation time down to 13 minutes. Also the <code>-jN</code> option is not listed in the set of available options with the default <code>--help</code>, you must instead call <code>--help-options</code> to see these additional more "advanced" techniques.</p>