I have noticed when using Firefox or Waterfox on some servers, the web browser is really laggy. A bit like if you had a incorrect graphics driver installed. For example as I write this it is taking a few seconds for the characters to display.

Yet using other Windows 2008 R2 servers I do not have this problem - all use the same server hardware and have latest graphics drivers installed, but it is only Firefox/Waterfox which is laggy.

I did some research into this, but never found a solution. Does anyone have any ideas please?