Environment question

Here is my setup:

internet <–> firewall <–> switch (me) <–> AP <–> SM <–> switch(users)

This has worked for three months very well, however, recently my users on the other side of the wireless are complaining about slow performance. If I run a bandwidth test from my side, I average 3Mbps. If I run the same test from the SM side of the system, I average 900Kbps.

Can anyone explain why this drop in performance? Any help would be appreciated.

What do you mean by a “bandwidth test?”
- Link test from the AP or SM?
- An Internet speed test (like DSLReports.com)?
- An internal speed test script you wrote?
- An internally served file download?

In general, more information is needed.