Rufous

			
Even though I usually read novels, play games, and watch movies and videos in English and post on English-language forums:

Your native language comes to you with much less effort. You understand things instantly, you don't have to gloss over unknown words, and so on. In a foreign language, it takes some work.

Now, in games like PoE that are heavy on language, I tend to prefer English (if that's the original language). But for others, it might be the opposite.

Sure, you don't need to look up every unknown word. But often, the word you're missing is quite important for the meaning - "She looked at me, tarrobribobulously, and pointed at a capavan high in the tree." Now, I can gloss over these things - she gives the protagonist a funny look and points to a thing, probably some kind of bird, and if it's important, we'll probably find out both things later on, but it's annoying, it takes you out of the flow of reading, and it requires effort. If that happens too often, it's tedious.