The only problem I have with VPN is that you cannot use QOS in your router. I have Toastman Tomato and if I activate QOS, the speed drops to almost nothing. I discovered that while playing with settings to find out why the VPN was so slow at first.
That is strange. Very possible that your VPN packets were catagorized into the "crawl" class. Don't think you need to disable QOS. Maybe find out what outgoing port is used for your PIA VPN service, and set that to a higher class.
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