1-12 misses out the wireless information unfortunately and as the problem is wireless it would be good to see the settings
When I read the post header it says "speed dropping wifi and wired". This would indicate to me that there is probably a connection problem not a wireless problem but if you need the part of the stats that give the wireless information perhaps the OP should post them for you.
13. BT Wi-fi: Yes 14. 2.4 GHz Wireless network/SSID: BTHub5-T787 15. 2.4 GHz Wireless connections: Enabled (802.11 b/g (up to 54 Mb/s)) 16. 2.4 GHz Wireless security: WPA2 17. 2.4 GHz Wireless channel: 12 18. 5 GHz Wireless network/SSID: BTHub5-T787 19. 5 GHz Wireless connections: Enabled (802.11 a/n/ac (up to 1300 Mb/s)) 20. 5 GHz Wireless security: WPA2 21. 5 GHz Wireless channel: Automatic (Smart Wireless)
hope this helps
no not used them, just been reading that others are having the same problem, and it as started like mine after or around the same time as the update on the 22/01/2015,