Running multiple containers on a single core or hyper-thread (which seems to be the primary way that containers are used), will obviously have a lot of non-coop

Running multiple containers on a single core or hyper-thread (which seems to be the primary way that containers are used), will obviously have a lot of non-cooperative context-switching, and will therefore have a very significant overhead compared to a solution that takes advantage of cooperative multitasking and cooperative context-switching.