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Firecracker trades run-time performance in favor of faster boot-time latency. It is something that is being addressed but afaik still exists. This of course doesn't mean anything if you want firecracker to boot a multi-gig JVM installation (the larger the filesystem generally, expect a longer boot time).
Security wise there are some minor differences. For instance bhyve supports virtio-rng but firecracker doesn't want to: https://github.com/firecracker-microvm/firecracker/issues/16... .
I think if your app requires fast boot time and your app supports that than it's fine (so services that spin up and down on demand) but apps that daemonize for extended periods of time or take forever to initialize probably not a great fit.
I love jails, bastille as a jail manager/builder is really great.
https://github.com/BastilleBSD/bastille