Vanilla nether portals are just purple blocks. And there is a loading screen when you travel between nether and overworld. Immersive Portals Mod (1.21.2, 1.21.1) enhances portals. Now you can see through portals. To go to nether, you just need to walk in.
Source: Immersive Portals Mod (1.21.2, 1.21.1)
Check Out: Minecraft Mods
Also visit : 9minecraft
Source: Immersive Portals Mod (1.21.2, 1.21.1)
Check Out: Minecraft Mods
Also visit : 9minecraft