Thanks for your post and apologies to hear that you are having an issue with your services.
Checking our systems at this end, all is looking good in terms of the Hub signal and power levels. Nothing is showing a miss and a view of the area over all is also looking good. There is no congestion affecting you.
As you are using a third party mesh systems, we need to look at where the issues appear. Please disconnect this from the Hub so your connection is only Hub - Ethernet cable - PC / Laptop. This will allow us to check the speed to ensure the hub is getting the correct information.
From here we can then add the mesh system back in to see if it's that which is causing the issues.
Pop back and keep us posted.