|You're missing my point, or perhaps I wasn't clear enough.|
You "internet bandwidth" has nothing to do with your "LAN (Local Area Network) bandwidth" and typically, your LAN bandwidth is a lot higher than your external (internet) bandwidth.
A typical highspeed package, be it xDSL or cable, is 1.5 Mbps
A typical SOHO Router these days offers 1000 Mbps on the LAN. The older ones offer 100 Mbps.
As you can see, in either case, the LAN bandwidth is significantly higher. 100/1000 Mbps as vs. 1.5 Mbps
What this means is, there are no tweaks you can do locally on your PC to improve your internet (external) bandwidth.
It only seems like it caused an improvement. What is more likely is that the number of users connected to the same server you were connected to dropped and you got more bandwidth as a result.
Just so you know, I have spent the last 5 specializing in Enterprise level Networking and have a total of 15+ years working in many aspects of the IT industry doing everything from hardware on up to domain administration. I say this to you so you know that I actually know what I'm talking about very well.
Any/all tweaks you can do on your PC can only improve your PC's LAN connectivity and nothing more.
The only way to increase your internet bandwidth is to pay your provider more money each month and get a higher bandwidth package. That is of course assuming they offer higher bandwidth packages. Mine offers a lite package, the "standard" 15. Mbps, a medium 3.5 Mbps package and a 10 Mbps package. But each is incrementally more expensive.
One last thing and I'll leave you alone.
People often get confused when talking about bandwidth. It's typical for people to think of it in terms of speed like mph or kph. It's not!
Bandwidth is a measure of how much data can travel past any one point in a network in one second.
The data on a 100 Mbps network travels at the exact same speed as the data on a 1000 Mbps network. The difference is, a 1000 Mbps network can move 10 times as much data in one second as the 100 Mbps network.