title: Speed of CPLEX vs CPLEX using SCIP
body: <p>I am new to LP and have only briefly used <code>PuLP</code> in Python.</p>
  
  <ol>
  <li><p>Why is there a speed difference between <code>SCIP 3.2.1 - CPLEX 12.63</code> and <code>CPLEX 12.6.3</code>? Doesn't SCIP still use CPLEX for solving?</p></li>
  <li><p>Why will someone use SCIP with CPLEX solver, instead of using CPLEX directly?</p></li>
  </ol>
  
  <p><a href="https://i.stack.imgur.com/twotJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/twotJ.png" alt="enter image description here"></a></p>