Sean,

we'll check 3gp case. Networking streaming in case of HTTP is relying on ranges support in HTTP/1.1 to give optimal performance and also expects that server side is doing correct job. Most HTTP servers mmap or similarly prepare files for interactive use if they are accessed through HTTP/1.1 ranges (i.e. if server has reported that it allows to use byte-based ranges to specify part of resource being accessed).

In this case it does but probably my 1mbps connection had some latency issues as well.