We mods notice it also, there are delays frequently reported to IB.
Please note that IB do a backup Wednesday night / Thursday morning, so expect delays around 08:00 GMT Thursday morning.
That excepted, if you experience significant delays, please can you let us know:
What url were you on?
What time did it occur?
What were you attempting to do when it occurred?
What did the error message say?
Did it go away when you attempted to refresh the page?
If it stuck around, for how long?
Use this thread to report problems.
Cheers
SD