Why is my school's wifi so slow?

You might as well have asked “why is my wifi so slow?”.

Slow wifi is generally caused by the same things regardless of the environment:

• poor channel planning causing co/adjacent-channel interference
• poor RF engineering
• too many clients devices per AP
• too many devices per channel
• RF interference
• cheap hardware

There are additional factors that can cause problems that are unrelated to the wifi, and will affect the network as a whole:

• overloaded switch uplinks
• insufficient address space
• overloaded DHCP server
• overloaded DNS server
• insufficient bandwidth to the internet
• insufficient firewall performance

This is why it’s important to spend the money to properly design your wireless network before choosing a vendor and buying a bunch of equipment. Questo è particolarmente importante negli ambienti scolastici dove c'è un sacco di denaro governativo "gratuito" che fluttua per finanziare questi progetti. Ci sono venditori senza scrupoli che vi diranno semplicemente di comprare un AP per ogni aula e metterlo lì, senza alcuna ulteriore pianificazione. Questa è inevitabilmente una ricetta per un cattivo wi-fi.