title: cbind runs very slow
body: <p>I have a large data.frame jobs, this is what it looks like:</p>
  
  <pre><code>jobs[1,]
    submittime  starttime finishtime  cputime maxrmem  host
  1 1367000999 1367000999 1367001001 0.017996      -1  i-sim-11-190
  length(jobs$finishtime)
  [1] 13280089
  </code></pre>
  
  <p>It's big, 11GB in memory.
  Now I have a vector <code>cputimenorm</code></p>
  
  <pre><code>length(cputimenorm)
  [1] 13280089
  </code></pre>
  
  <p>So I wanted to add this vector as a column to jobs:</p>
  
  <pre><code>jjj &lt;- cbind( jobs, cputimenorm )
  </code></pre>
  
  <p>And this is still running for 16 hours already on a powerful Proliant server with 400GB RAM.</p>
  
  <p>What am I doing wrong?</p>