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I have installed Ubuntu 15.04 x64 recently.

I have observed that in comparison to non-encrypted installation, the installation with encrypted home directory results in slower boot time: without encrypted home folder (hence unencrypted swap partition) it takes one iteration of preloader animation to boot, but with encrypted home directory and swap it takes 3-5 iterations, so it is significantly slower.

It is normal in that case?

I have thought that nowadays processors (for example my intel i3) should manage encrypted data faster, I mean the effort should be non significant.

  • It is normal. It takes some time to read data from disk and decrypt it. – Pilot6 Aug 10 '15 at 13:35
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It behaves fine under normal circumstances it will bring your machine to its knees when doing any kind of intense file operations.

While encryption for sure will add overhead, encrypting the home partition should not have a big impact on your system's performance.

Most of the programs you run are read brom /bin or /usr, and most of the regular system writing is in /var or /tmp.

You can refer this thread for more info What is the performance overhead of encrypted /home?

  • Thank you for your answer, I am aware that in general encryption adds some overhead, but I was strictly interested only in the process of booting OS :) I was surprised that now booting takes 5 times longer than before – Hooberd Aug 10 '15 at 13:52

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