Download accerator on cable internet

I was just wondering if it is possible to run a download accelerator on cable internet?
My internet always feels like it is about to die. (and it does quite often)

What’s your downstream speed supposed to be?

about 3 Mb/s

Sorry I’m not answering your question directly (I don’t know), but at those speeds the Internet should be working well for you. Have you checked your system for spyware and viruses lately? If your system is clean, what results do bandwidth speed tests give you?