IP severely lags my system. would be nice to instead have this mode allow custom door block to teleport on use or something.

Sadly this mod makes use of the portals that "Immersive Portals" creates, if you would like to not have to use Immersive Portals, you can go into the config of IP and change nether portal mode and end portal mode to vanilla, meaning they will be like vanilla.

I was thinking. I personally, am someone who has horrible performance honestly. I might fork this off and try to remove the requirement of IP in a version of my own.