Desktop PC seriously struggling with internet

[Callumdinnes]

Hello I am having issues with Sky Broadband solely on my Desktop PC. It connects to Wifi fine but doesn't connect to the internet. None of the other devices connected (phone, laptop, fire stick) to the hub are having this issue. It seems if I try to load some websites it fails at first but slowly begins to kick in but that's not sustainable. I've tried the simple things like moving the PC closer, but it's only 7 metres away with 1 wall obstruction and my phone works fine in the same place. Have also tried updating the Wi-Fi adapter drivers, restarting modem and PC, ran windows diagnostics - all with no avail. Any help would be appreciated.

[GD1]

@Callumdinnes  What browser are you using?  Have you cleared all the cookies/cache?   Have you triued ethernet between the PC & hub?  Have you run the flush DNS option in windows?

How old is the PC?