Is that kzn? Please check a traceroute for dslam congestion. Youtube shouldn't be too bad. My kids were watching youtube on xbmc last night around 19h30 without problems.
Seems ok?
>tracert
www.mybroadband.co.za
Tracing route to
www.mybroadband.co.za [197.242.89.170]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.1.1
2 18 ms 9 ms 17 ms ti-***-*-***.telkomadsl.co.za [***.***.*.*]
3 22 ms 21 ms 19 ms ti-224-0-38.telkomadsl.co.za [105.224.0.38]
4 23 ms 23 ms 22 ms ti-228-0-13.telkomadsl.co.za [105.228.0.13]
5 70 ms 77 ms 73 ms 165.165.216.217
6 56 ms 33 ms 43 ms 196.43.52.42
7 24 ms 23 ms 41 ms 196.43.25.138
8 20 ms 22 ms 61 ms internet-solutions-gw.telkom-ipnet.co.za [196.25.127.182]
9 22 ms 25 ms 21 ms ar2-rba-gi0-1.ip.isnet.net [168.209.1.172]
10 21 ms 21 ms 21 ms mi-za-rba-gsrpe2-gi1-1-0.ip.isnet.net [168.209.86.250]
11 * * * Request timed out.
12 49 ms 50 ms 63 ms core.gp-cn-het-mee-1.to.gp-mr-vod-e-.dfa.p2p.10g.za.africainx.net[41.84.12.151]
13 66 ms * 48 ms 41-66-132-242-f2.het001-cpe-1-to-gp-cn-het-mee-1.africainx.net [41.66.132.242]
14 51 ms 50 ms 49 ms core-access-switch1.jnb1.host-h.net [197.189.193.1]
15 * * * Request timed out.
16 50 ms 48 ms 46 ms 41.203.24.42
17 104 ms 49 ms 79 ms 197.242.89.170
Trace complete.