how dpdk improve guest performance

Folks, If I am running dpdk in my compute nodes then sure it will reduce kernel overhead but how does it help to improve guest network performance? Inside guest vm it's going to use kernel to copy packet to userspace. in my example we run high performance haproxy which handles 300k to 500k connections but I have noticed performance is poor and lots of packet drops. If I run the same workload on SRIOV vms it works fine and I notice less kernel context switching inside the guest VM. I think when you run DPDK in compute then it only help compute but not your guest network performance. How do I improve guest performance also with dpdk based compute?