The situation is between 2 place with high latency e.g. 60ms from China to Taiwan. The IPLC link is 20mbps, the test PC hase been tcp optimisation increase window size.
If one FTP test session still can not reach for example 10%(vs 100Mbps LAN), 10Mbps, the provider say have to multiple session can reach above 15%(vs LAN) 15Mbps.
Is this reasonable?