Originally Posted by 
PhilipA
				
			 
			I have the opposite experience with Optus.
Up until about 3 weeks ago I was getting down to 2-3 Mbps in peak times.It drove me mad and I rand Optus several times.
Lo and behold suddenly 3 weeks ago The speed increased to 10-11.5 Mbps at all times and today after a drenching it is still at 11.
Hallelujah!
I guess Optuse purchased more bandwidth from NBN.  
So my message is that it is most probably the ISP that is at fault for poor NBN speeds other than of course hardware faults.
Regards Philip A