VPN slows down LAN internet connection extremely

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    I've never noticed this before, now that I've changed my VPN provider, I wanted to test it via a speed test.
    On my PC I have a good 800 Mbps of 1000 with the same VPN server as on the box - on the Z11 only between 150 and 90 Mbps with the same app, on the PC via Blustacks (for testing) - The box is prioritized in the router, port sharing is enabled. Without VPN, the Z11 also reaches about 800 Mbps.
    Why is the Z11 getting so slow over VPN while the same app is running at almost full speed on PC?