Hmm, well there is always the possibility of specific hardware error but this has been an ongoing problem with my Surface Pro. I swipe back to a prior page and the little dots get going and it just sits there sort of grayed out for 10 seconds or more. Also, I'm not experiencing lag anywhere else, just in Metro IE.
Hmmm, just tested a relatively graphics-heavy website Product reviews and prices, software downloads, and tech news - CNET and yeah, when I swipe back each page takes 2 to 3 (or more) seconds to refresh with the little dots running across the bottom. I am guessing they are having the server reload the page which really is unnecessary; it should just be cached and load instantly. They should at least give us an option of how we want that to behave - reload or just go to cache.
Also sometimes I swipe back and the prior page momentarily appears grayed out then the page I swiped from reappears and I don't go back to the prior page at all.
** Ok, I turned off all the privacy settings that might have been slowing things down some and it does seem a bit faster. I notice a website like MSN that is optimized for Windows works very quickly, but others do not.
Ah ok. I don't back swipe a lot and never noticed if it was site specific. I just went to a couple open sites and tried to swipe back. All went fast, less than a second. I will play around with some others over a couple days and let you know if I encounter any of this lag. Which "privacy" settings? I just browse at defaults, probably a bad idea, but maybe that is one reason. I use "in private tab" sometimes but haven't noticed any lag but I will try that too. Well either way good luck, hope it sorts itself out for you.