I just purchased Deco M5 and it's working superb. I am getting better range in every corner of my house. 

As soon as I create a profile in Parental Controls section and add a device in the profile, certain websites become too slow on that device. Remember that I just created the profile, not activated it. So internet should be working normally on that device.

For example, when I added my phone Redmi Note 7 Pro in a Parental Control profile, I was able to open youtube.com and search videos on my phone, but videos were not streaming. I was able to open fast.com, but it was not giving me internet speed. I was able to login to webex app, but was not able to join any meeting. If I wait for long time (4-5 minutes) on fast.com or youtube.com, things start working. Usually, such delay is observed if domain name is not resolved. So, it seems like profiles in Parental Controls are causing some DNS issue to the devices added in those profiles. 

I tried creating parental control profiles for my other phone Samsung Galaxy M31s and my LG TV unit. Same issue was observed on those devices as well. At the same time, everything was working perfectly on my office laptop, as the loptop was not added in any of the parental control profiles.

With this issue, I am not able to use the Parental Control feature of Deco M5. 

Please suggest a workaround.