When playing with armors mods that give players more/better exoskeletons, it is easy to simply walk through a portal without it teleporting. And yes even if you have high movement speed the portals are still useful because megabase worlds are just big... enormous. I have 12 vanilla-like exoskeletons atm in power armor mk4.
So how i currently have to work around that issue is turning off exoskeletons each time i use portal. Works but not very convenient.