We have a SonicWall NSA240 connected to ATT Fiber 100/100 (customer managed router).
Problem: Everyone's web browser is taking way too long to load up the webpages. This is occurring in IE, Firefox, Chrome.
I've already tried disabling Content Filtering and Gateway AV under the SonicWall services and still the same issue. I've already done a speed test from both ATT website and speedtest.net and I am averaging 90/85 respectfully.
I am not sure what else to try? When I try to open up Yahoo/Engadget/Spiceworks it would spin for 10 seconds sometimes longer before the webpage actually appears.
My next step is try to change the DNS servers on the SonicWall to googles 8.8.8.8. Currently its pointing to the preferred and secondary ATT DNS servers.