I'm sure Jimmy will be able to expand on this but I'm guessing that if the site is being worked on by staff, like structural changes large uploads etc, this may cause some slower experiences. Of course there are many variables such as ISP speeds due to external maintenance, faults at ISP networks, large volumes of site traffic etc. All I know is, for a forum that has such high traffic and massive amounts of content things run fairly smoothly in general.
I'm sure I speak for the rest of the team when I say, if you experience any issues then let one of the mods know and rest assured, if Jimmy or the staff can make your experience better, they will.
