Also depends on vpn provider
which one you use?.?.?
Im using surfshark but you can also decide which device use vpn and which can bypass vpn and use internet directly at full speed
is vpn setup on Gl-inet router?
@mdpatel can you show your IPv6 settings on both ZTE and X3000 please
Yes I’m using openvpn for iot devices
use any third party paid service for openvpn? or free?
I have 150+ iot devices all work that way without any issues.
Definitely vpn is paid from surfshark. You can discover if any free provider.
Yes, Definitely you can.
Gl-inet openVPN server and Gl-inet openVPN client both solve this tapo issue without using any third party paid service?
i have Regret to buy GL-X3000, not work with IoT devices.. like LG thinq and tapo and may be many more.
ZTE MC801A (115 USD) : work with all IoT devices
GL-X3000 (450 USD) : not work with any IoT devices.
Very disappointed with GL-inet..
Maybe you can change the LAN IP to 192.168.0.1 and also adjust the mtu, from 1500 to lower like 1428.
Solved..
Yeeesssss connected. 
Change MTU to 1428 and reboot..
Thankkkkkkkk youuuuuu so much dear...
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does MTU number effect on internet speed?
Yes, it does. Finding the perfect MTU will require testing. See Ping Test to determine Optimal MTU Size on Router - NETGEAR Support
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Wow that’s very good, is it that MTU effect speed is there any optimal MTU?
As the guide describes you should add +28 then.
Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting. For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting.