OK, I don't understand:
Can someone explain how changing your MTU affects download speed differently for different users?
I could understand a maximum of a 3% improvement if the MTU is set to an exact multiple of the space in an ATM frame minus any extra headers, but I can't see how this can be different for different users.
The 3% comes from an MTU of 1500 divided by the number of data bytes in an ATM frame ( 48 ) = 31 ish, so trimming it to exact 30 frames will save a whopping 3% but surely no-one notices this different?
Moderators note by John (johnessex) Brackets around 48 moved for you to prevent the smiley coming up.