Another apple tech thinks that too many devices are jumping on the g/n radio, which is slowing everyone else down. He thinks there are too many SSIDs being broadcast and causing interference. He says there are more channels in the 5Ghz band and only 3 in the 2.4Ghz.
The main issue we have is teachers not being able to mirror from their laptop/ipads to Apple TVs. I think it's an Apple issues, not a wireless network issue.