I have freshly installed Ubuntu 22.04 on my Macbook Air 13 Inch Mid-2013. I enabled full disk encryption in the setup process (CPU supports AES-NI, all latest updates installed).
When starting programs it takes very long for them to start up (e.g. Firefox). Also commands in the terminal run very long (e.g. a few minutes for apt install tmux) - which should be quite fast. It is to a degree that the system is not usable anymore.
Some investigation
Transferring single files is fast:
dd if=/dev/zero of=/home/admini/temp/test.img bs=5GB count=1 oflag=dsyncresults in speeds of 480 MB/s
After a bit of digging I notices atop showing low IO performance at times when I also experience a slow system. However, if I run the dd command above, this does not slow down the system. Only certain actions on my computer do (e.g. apt install ...)
atop while experiencing slow performance (while updating Firefox via the build in Software Center via snap):Output of atop
LVM sda3_crypt busy 88%LVM gubuntu-root busy 88%DSK sda busy 91%MB/s read and write are only around 0.0 - 0.2 MB/s. CPU usage at 1%. Memory is 7.7 GB free.
It looks like there is some issue with the SSD, Ubuntu & encryption - however I'm not able to figure out whats going on here and how to fix it. Can you help?