Speedrunners in Minecraft use a technique called "Nether Portal Boosting" to create Nether portals quickly. The idea behind this technique is to use the momentum from your movement to "boost" yourself into the Nether portal, allowing you to create it and enter it in a single motion.

Here's how you can create a Nether portal quickly using this technique:

Build a two-block-high pillar of obsidian, with the Nether portal on top.

Stand at the bottom of the pillar and use a running start to jump into the Nether portal.

The momentum from your running jump will carry you into the Nether, allowing you to create the portal in one smooth motion.

Speedrunners often use other techniques as well, such as glitch exploiting and optimized block placement, to create Nether portals even faster. The specifics of these techniques can vary depending on the version of Minecraft being played and the individual runner's playstyle.
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