I just installed the firmware update for the Deco M9 plus and noticed some strange performance issues around streaming Netflix, youtube, MS teams and accessing google chrome. 

I have 300mb Fibre internet direct to the house and the ISP is Fibrus. 

I oringally thought there may be an issue with the WIFi dropping out. I've carried out a speed test at the modem, on the deco app and also at some of the devices connected on WIFI which seem to be ok. 

I've reset the modem. 

I've reset the deco units and setup the home network again. 

Also come across a news story on the Suns website about similiar performance issues with Sky customers.  

On my PC I've tried going through a VPN to access google chrome / youtube and it loads straight away. If I take off the VPN it takes forever to load if at all. 

The samsung TV and firestick struggles to load youtube / netflix however my iphone youtube app loads with no problems at all. 

I think something strange is happening with google / streaming apps either being throttled by the Deco network or Fibrus, although it only seems to have started after the firmware update. 

Has anybody else noticed any similair performance issues or have any suggestions on things to try?  

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Update:

I’ve tried connecting a laptop to the modem directly using a network cable and access to YouTube / google loads quickly.

When the same laptop is connected to WIFI through the deco mesh network it does not load. This suggests it is not an ISP issue.

On the deco app under ‘protecting your network’ there have been a couple of threats blocked to some random website but not youtube / google.

I do not have any parental control profiles installed since setting up a new home network.