iOS apps content delays
I have a T35-W running 12.5.11 and an AP125 access point.
Some iOS apps are showing signs of delay when connected to my WiFi and I'm struggling to identify a cause.
Opening the Amazon shopping App, the initial home/screen of the app opens but its content can take around 10 seconds to appear.
Apple News app, opens successfully, but content can take 10 seconds to appear.
Switching to mobile data and running the apps again, the data loads immediately.
So, something in my setup is delaying data and I can't work out why.
I have HTTP, HTTPS and an Outgoing proxy dedicated for mobile devices and I've tried turning off Subscription services (such as Gateway AV and WebBlocker) but the problem remains.
What should my next steps be in my investigation?
Thanks in advance.