We host a website that servers up mostly static files, such as html and flash SWF files. The server is hosted in Auckland, New Zealand.
Our customers are mainly secondary/high-schools. In general, most customers can access our website at perfectly acceptable speeds.
For some customers in a certain region of Australia, we are receiving reports of extremely slow loading times for our website.
After talking to a couple of system administrators at the schools, it sounds like the common thread is that these schools share the same ISP. From what I can gather, the ISP is throttling the traffic coming from our website.
What methods and tools can I use to determine if this is in fact the cause?