What don't you try speedtest.net? It figures out where you "are".
I find that Comcast, AT&T, Charter and Cox seem to like to use that.
If you suspect a problem with the PC, run the same test on your iPhone or iPad and compare the results (at least for wireless). If my PC is not as fast as my iPhone or iPad, I need to figure out why.
It I use speakeasy, it reports ~1/4 of what speedtest reports and if speedtest tells me I ain't getting what I'm paying for, they are gonna hear from me (free HBO for 6 months!!!).