Simple bash script to test disk speed.
# Test disk speed in current directory
$ diskspeed.sh
Writing .: 251658240 bytes (252 MB) copied, 1.91234 s, 132 MB/s
Reading .: 251658240 bytes (252 MB) copied, 0.0470604 s, 5.3 GB/s
# Test disk speed in two folders
$ diskspeed.sh /dir/encrypted /dir/not_encrypted
Writing /dir/encrypted: 251658240 bytes (252 MB) copied, 1.39117 s, 181 MB/s
Reading /dir/encrypted: 251658240 bytes (252 MB) copied, 0.0474908 s, 5.3 GB/s
Writing /dir/not_encrypted: 251658240 bytes (252 MB) copied, 0.747143 s, 337 MB/s
Reading /dir/not_encrypted: 251658240 bytes (252 MB) copied, 0.046063 s, 5.5 GB/s
(Not necessary. You can run script using full path)
$ git clone https://github.com/jedvardsson/diskspeed.git
$ cd diskspeed
$ ./INSTALL.sh