# Design flaws/bugs in subuser

- Application startup time is slowed. On my system with Docker’s `aufs` backend it takes 2.5 seconds extra time for all applications, be it `vim` or `iceweasel`. I have read reports that on newer systems with SSDs and `btrfs` this can be reduced to a quarter of a second.

- Certain things involving sharing of data between applications, like the clipboard in vim, just won’t work.

- DBUS/gsettings don’t work between subusers.

- Inheriting the $PWD is a generally shitty idea. If I run vim in my home dir, it can see and edit all of my files. The only security advantage is if I run vim in some subdirectory.

> - I hope this will be fixed by something more sophisticated like giving access only to paths specified in the command line arguments.

- Disk usage is several times greater when installing one container per application due to the reduced ability to share dependencies

> - Docker will soon have ZFS support, which has limited support for block deduplication. Maybe future versions of Docker will have a venti based storage driver thus solving the problem perfectly and elegantly and also making updates even faster than on a traditional system.