The nature of any shared resource (and this includes "dedicated" *connections* such as fiber optic or DSL - they are shared at a switch at the ISP office) is that performance drops as utilization rises. Residential usage does rise dramatically in the evening - I've noticed this too. If this was a mission critical problem, you could purchase dedicated *bandwidth* - which is dedicated all the way to an internet trunk (even if the connection is shared). I'm pretty this would not be cost justified for residential use - unless you have money to burn. Our business had 2 mps dedicated for a few years (can't imagine paying for 150mps dedicated), but the cost got too high, and we are back to shared.
The holy grail for this problem is QoS extensions - where each packet is tagged with the level of service you are willing to pay for. You could be downloading the latest 30G Fedora release with "space available (bulk)" while talking on VoiP with "low latency" and your neighbors are streaming movies with "high bandwidth - latency ok, so buffer out the wazoo".
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RE: Speed difference between morning and evening is staggering
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