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Re: Wifi painfully slow - especially on FB
Now, your phone's WiFi radio may be the root cause, but I doubt it. It sounds more like a software issue. Have you tried using a different browser/ Facebook app ? Tried purging your app caches on both Browser/Facebook app and the rest of your apps ? Tried forcing a system stop on your browsing/Facebook app (settings/apps/ - Force stop) ?
When a phone's WiFi radio seems to be having a hard time, the phone is not necessarily 100% to blame. If you live in an area with many WiFi waves colliding, like an apartment building, or a townhouse, you could have a WiFi channel conflict with other routers in the vicinity, and perhaps your phone doesn't deal well with this. You can use these to find conflicts, and then manually change your router's channel to one that is less busy.
Your phone could be the culprit, but so could your router's settings. I once I had problems at home, my router kept on crashing whenever to many WiFi devices became bandwidth-hungry. I found out I had a channel conflict, being on channel 6 with 11 other routers in range set on channel 6. I switched to channel 11, and my problems went away. The odd thing is that the problem was triggered by my better half connecting a new phone, Worst, after it started, it would keep on happening afterwards even without her phone in the picture.... Go figure....
Once this was settled my phone was faster on the web than it ever had been.