I have not tested this since the updated version of SL3. I will try to do that and let everyone know what the experience was. I mainly use Chrome or FIreFox but I will also look at Edge and IE. I can also look at my local browser settings as Owen suggests and see if I find any thing that pops out.
I know when I was working for a corporation, the IT people did find the local settings they needed to improve performance. One problem they had was different Internet Providers had different settings so they had to adjust browsers for that.