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Since the issue of slow VPN is a Broad issue, we can only provide with some general suggestions.
First, it is important to find if your VPN is the main reason for the slow Internet speed. Disconnect the virtual private network completely and check if speed increases. If VPN speed and direct connection speed differ, try the following steps:
Use a wired connection instead of Wi-Fi
Reboot the router
Update the firmware of the router
Try using a VPN for only one device
Change adapter settings > VPN connection adapter and select the Properties option> Internet Protocol Version 4 (TCP/IPv4) option> Click the Advanced button> Clear the Use default gateway on remote network option
More more details, please refer to:
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