I am fully prepared for this to be my fault and honestly I hope it is.
I picked up an Alta Labs 24 port switch a few days ago and ever since then I have been having slow wifi speeds.
Like as in 20Mbps max. Its making basically everything on wifi un-usable. Confirmed on an iPhone 15 and a Macbook Air
The only difference is the AP is now connected to an Alta Labs switch not a Unifi switch. I checked the settings but I cannot see any obvious speed limits etc.