I am no expert on this and as I suggested everyone's system is different.
If you have plenty of RAM, such as Serenity (WOW! Wish I had that much! Specially for image work) then your system may be keeping your back pages there, ergo instant recall. If on the other hand you only have 128Mb (like me) then a temperorary area on the hard-drive is created such as Gunny's. 894Mb sounds huge but if you've got the space on your HD, and it's only temporary anyway, that shouldn't be a problem. The drawback is that the files have to be recovered from the HD each time you go back to a previous page. If you can, reduce the size of the temp file Gunny, say by half, and see if that makes a difference. I admit I don't know much about IE, I try to avoid Gatesie's products where I can.
The cache stores pages you visit so that next time you go there they can load a bit faster, but only if the original hasn't changed in the meantime. If the system finds that it has, it downloads the new page instead. I know this isn't what I originally implied, but I'm still learning
too.
What I am sure of is that it has nothing to do with the server, just your local settings, speed, etc.
GG
The Gods made Heavy Metal!