No, no back button and no Internet accelerator. I have done this test many times, on different days, and consistently get 500-600 when using Firefox, and 1400-3000 when using IE. It makes no sense to me at all. If it were java-based, then maybe the difference between Sun Java and MS Java Virtual Machine might have something to do with it - but since it's not, I'm perplexed. Several people on the DirecWay forum on DSLReports have mentioned noticing the same difference.