title: What's the most efficient way to read multiple large .CSV files into a dataframe?
body: <p>I have a 720 csv files which are 7.4 GB in total (or a 1.5GB zip file, compressed). What's the most efficient way to read the data into R?</p>
  
  <p>From my research, <code>fread</code> of <code>data.table</code> seems like the fastest way to do so. However, it's still taking a long time to do so (I'm asking this question with the fread has been running over 40 minutes). Is there a faster way to do it?</p>
  
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  <p>(Edit to delete my solution).</p>