Problem: Apache needs very long to start on a virtual server running on a KVM/QEMU virtual maschine.
Solution: Apache needs a RNG (random number generator) for startup, probably because of TLS. A pure virtual maschine has no RNG device per default. If you add an RNG device to the virtual maschine configuration, apache startup is lightening fast.
<rng model='virtio'> <backend model='random'>/dev/random</backend> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </rng>
Versions: tested with libvirt 3.0.0, qemu-kvm 2.8 on devuan 9