Here in Brighton/12 Corners area I notice almost no difference between speeds in the daytime and evening. It is pretty lock on 30/5Mbps for me, as long as I use the Syracuse speed test site. The TWC test for Rochester actually reports slower speed results for me, and Speedtest.net speed tests are extremely variable depending on the speedtest test server I select.
Things are not so rosy at a relative's place in Spencerport, where her service maxes out at around 3.5/1Mbps. Interestingly, the download is the service suffering major speed degradation -- upstream speeds are solid.
In my experience this is one of two things:
1) Oversaturated node.
2) A technical fault, sometimes with TWC's equipment, other times with the physical infrastructure nearby.
Early evening slowdowns seem most likely to be oversaturation, especially if they are consistent when they start and end. Technical faults are usually causing issues all the time or during certain weather events.
I also expect oversaturation when a call to technical support only brings out vague explanations surrounding the fact they see nothing wrong with your cable modem connection. They don't seem willing to admit when they have oversold their network in a particular area and are reluctant to schedule a service call. If they do, usually there is no speed problem when the tech arrives during business hours. They may even replace the drop, work on the pole, or replace fittings, but the problems immediately return once evening arrives.
One would think D3 service might correct some of this.--
Phillip M. Dampier
Editor, Stop the Cap!