Browser loading speed has slowed since I get TMO Home Internet and don't know why.

A Windows update could have knackered up some things with the network stack... is prone to locking the receive windows and/or MTU to weird values and such.

Can go to the broadband tools section at speedguide.net to download their TCP Optimizer to reset everything quick and easy.  They may even have a link directly on the home page for it now it has become so popular.  You just right-click it to run as Administrator, pick the network card from the drop menu, and click to reset things to Windows Defaults.  It will prompt to make a backup (has a restore function as well), and then prompt you to reboot the system to apply everything.

After that, go back to speedguide.net and go to their TCP Analyzer page.  It should flag a notice about the MSS/MTU not being optimized.  Windows SHOULD be detecting and setting MTU at 1420, which is not optimal by normal standards but what is required because of their funky IPv4/v6/v4 tunnel crud they are doing (technically, you may be able to override it to 1440, but that can work against you in some network situations...1420 is the more common values used with MTU discovery).

That is important to verify, because if it is too high (ie, trying to run the usual numbers between 1460 and 1500), it can cause packets to be broken down into two smaller packets... bogging things down.