MaxTut Wonder has created a rather interesting Jira:
ISP Traffic Shaping can be a pain, I’ve experienced woes before when World of Warcraft traffic wasn’t being identified correctly. My ISP is supposed to give priority to games and live video streaming, but during the WoW woes, WoW traffic wasn’t getting a priority.
However with regards to Second Life, I’ve never noticed anything untoward that would make me think traffic shaping was an issue and as I’m on a better package these days, I wouldn’t expect it to be an issue but MaxTut Wonder is claiming there is an issue for him when it comes to Mesh items rezzing and he’s convinced it’s due to traffic shaping, as he states within the Jira comments.