title: which version of openssl gives better speed?
body: <p>I am using openssl for my encryption work in my project where I encrypt files. The encrytion/decryption process takes too much time. So which version of openssl should I use for better speed? Any lighter version available?  </p>
  
  <p>I have also observed that openssl-1.0.2a (latest) gives the worst performance regarding speed. But If I build it with O3 optmization, performance is better. But for lower versions, performance doesn't increase in a considerable amount for optimization. Why is it so? </p>