All containers are, are isolated preccesses so its barely different than launching any other process.

The two biggest differences are that containers use more disk space vs non-containers and that containers won't use shared libraries. That means that instead of loading up 1 version of glibc for most of the OS, you end up with n containers glibcs loaded up.

Practically speaking, this isn't really a huge deal. A lot of those libraries fit in less than 1mb. A disaster if this was my childhood computer. A non-issue on modern systems with more than 512mb of ram.