Also setsockopt TCP_MAXSEG = 536 and do small sends with your own ID numbers. When one IP fragment from a fragmented packet goes missing everything stops and th

Also setsockopt TCP_MAXSEG = 536 and do small sends with your own ID numbers. When one IP fragment from a fragmented packet goes missing everything stops and then everything from that packet is resent. On lossy networks that bigger packet has a bigger chance of again having a missing fragment so there will be an additional delay.