Systems, methods, and computer program products to perform an operation comprising receiving a first data frame and a second data frame by a device driver of a first virtual network interface controller (vNIC) of a plurality of vNICs sharing a physical network interface controller (NIC) of a computing system, storing, by the device driver of the first vNIC, the first and second data frames in a first queue for the first vNIC, generating, by the device driver of the first vNIC, an optimized data frame comprising the first and second data frames, wherein the optimized data frame specifies a modified Ethernet preamble, and sending the optimized data frame to a hypervisor of the computing system.