I'm on a 4Mbps Premium Uncapped package and my experience is as follows:
I've been having the exact same experience as the rest of you, horrible speeds throughout the day on all services, including loading web pages and streaming from YouTube. As people have mentioned before, the only time I actually get line speed is after midnight and generally on weekends (not guaranteed though).
Most of the time it feels like everything is being shaped to 2Mbps and sometimes even 1Mbps. Can barely stream a 720p YouTube video. I've spoken to 5 people from MWEB including 'technical specialists' and they have even escalated the issue to the network engineers who have simply responded by saying that: "All services are running as expected, can't find any faults. You cannot compare a capped package to uncapped. We shape appropriately during peak hours to try and balance the load, etc."
I've tested using Afrihost and CrystalWeb capped packages, both of which give full line speed 24/7, to demonstrate that it is not exchange/congestion related, but purely to do with MWEB's shaping policies. In a semi-busy household where 4-5 people are using the internet at the same time, these problems with MWEB are exacerbated. Even as I am typing this now, I cannot get more than 2Mbps which makes me wonder why I am even paying for 4Mbps, if I only receive that speed 10-15% of the time?
Now I do my fair share of downloading (200-300GB monthly) with most NNTP downloads scheduled between midnight and 08:00, I have told them I couldn't care less if they shape NNTP/p2p during business hours but HTTP and streaming should be prioritized!
So the bottom line is: After many weeks of submitting various tests and being bounced around between 5 different consultants the answer I have received is basically, "This is how our system is designed and is working as expected", i.e. nothing will change. I hope MWEB realize how many people are jumping ship to other ISPs simply because of this. Maybe with enough complaints about the same issues they will pull their heads out of the sand and actually look into revising their shaping policy, or buy more damn IPC!