My desktop is running xubuntu 14.04 and my internet access is terrible with pings up to 9000MS. I created a new user account and I show ping speeds around 30ms, and browsing is fast. How can I find out what's wrong with my main account?
Probably when the old user account is used to log in, the system launches automatically a bunch of daemons which are greedy in network resources.
Here's some command that you can run to see if there's anything unusual that pops up:
nethogs netstat -anp ps -ef nload iftop
I recommend to try nethogs first, to see if there's anything eating your bandwidth.