If you’re having throughput issues with high-bitrate files, I’d advise to look at one of these wiki entries and try mounting your media share via FSTAB and SMB or NFS (depends on what you’re using and what you prefer, but NFS will give even better throuput):
Throughput issues are mostly resolved by following those guides… The limiting thing here is mostly not the Fast Ethernet of the Vero 4k, but the mountig method.