Firefox slowing downloads?

[KagoKajino]

Yo, I was trying to download Team Fortress 2 Classic and its about 2.8 GB download. My internet is 25 Mb down (around 3.5 MB). I have a program that shows me my network speed, since I like to look at the speed change. I was looking at it and it said it would take 4 hours to download, so I check the monitor and it says I was downloading at 500 KB! Can someone explain why this is? I already tried disabling all of my add-ons. The only other thing I could say is the issue would be that this is a special flavor of Firefox called Icedragon, but all it does is add a few security features. I also get this issue on Chrome. Steam still downloads at the correct speeds, though.

 

Edit: Its been a little while and now it will occasionally go up to the correct speeds and then drop back down.

Edited August 14, 2017 by PcGamingNooblet
To add more context

[2FA]

It could just be that the download server is slow. I've encountered that issue quite often.

[LogicalDrm]

Usually it means server isn't giving you more speed. I just had this issue with Vimeo not giving me 1-4meg speeds on my mobile connection and breaking up download even with normal 100/100 Wifi.