I enabled VPN server functionality of AX3000 to access my home network from the internet. However, I'm experiencing quite low speeds with this.

I have 1000/100 mbps internet connection. Sample speedtest from wired connection: 933.62/102.91 mbps.

Device I use (mobile phone with 5G network) has 194.44 / 50.14 mbps speed at the time of the test.

With this information, my speed when connected to home VPN should be around ~90 mbps. However, I get 17.21 / 8.86 mbps. In other words, I get 16% of my total bandwidth when connected to router VPN. This is extremely slow. Is this a well known issue? 10% or 20% reduction in speed can be justified with extra processing on the router but more than 80% reduction in speed has no excuse.