Yes, that's why I mentioned the number of competing devices on my home network, & yes, all 17 cameras are accessed remotely as they're all cloud-based.
As I said in an earlier post, I'm not concerned about speed test results, other than the entertainment value of looking at them, all that concerns me is how all my devices function.
Thanks for all the replies.
After monitoring the speeds for the last few days I am relieved to find that all is now good. Down average is between 460Mb and 500Mb, with up being 70+Mb.
I would say the system just took a couple of days to find a reliable speed to my property.
All is fine now, with speeds i am very happy with.