OpenVPN speed issues, but server and home speeds are more than optimal.

Following a guide to setup a openvpn server on a droplet, I’ve come to a puzzling conclusion.

*Testing my vps speed is:
Testing download speed........................................
Download: 607.40 Mbit/s
Testing upload speed..................................................
Upload: 264.37 Mbit/s

Testing my home speed NOT through vpn is:
Testing download speed........................................
Download: 146.77 Mbit/s
Testing upload speed..................................................
Upload: 10.86 Mbit/s

Testing my home connection TO my vps:
Testing download speed........................................
Download: 144.83 Mbit/s
Testing upload speed..................................................
Upload: 11.87 Mbit/s*

BUT after connecting to my openvpn setup, USING port **443/tcp not the defaults** .......

Testing download speed........................................
Download: 11.33 Mbit/s
Testing upload speed..................................................
Upload: 4.12 Mbit/s

Why is it nerfed so hard?

Is there anything I can do about this? I don’t think it has anything to do with my ISP throttling my connection, as I have not had any issues with any other services. Even using a paid for vpn, like PIA, gives me slightly better speeds.

Edit: Here’s my config

port 443
proto tcp
dev tun
sndbuf 0
rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"
keepalive 10 120
comp-lzo                                            #Tried with and without
persist-key
persist-tun
status openvpn-status.log
verb 0
crl-verify crl.pem