^ That is crude and not exactly how it's done and the render engine will optimize based on where you're looking. You are on the loaded cell and wherever you are looking off into the distance are also loaded (immediate cell is guaranteed load usually) and the adjacent ones aren't loaded as strongly (using load orders / poly rating). The way open world maps work is that they operate on a grid called clustering. Player pop-in makes sense since this is a free to play game and they can't just provide an unlimited amount of resources to support greater amount of bandwidth quota per player. There is a slightly higher overhead in CPU cycles but that's not a big deal considering. One of the simplest approach is to add in a fade-in/fade-out asset feature where the pop-ins and outs are less noticeable. Game engines usually handle this in various creative ways. Also just to point it out, the blades of grass are procedurally generated like most terrain features so it comes at little render cost. Meaning the same tree assets that are being rendered in front of you will pop-in a couple of meters away once you move. You don't have to travel fast, just walk and you'll see pop-ins. While there is a finite limit to how many unique mesh and textures can be stored in vram / other storage, the visual pop-ins are really bad to the point that your nearby view feels broken. Other games reduce the pop-ins with smaller maps with and (loading) portals between each map part. The problem is, no one has the machine to keep all this in their cache! This means every object, including every tree, stone, and blade of grass.
To completly get rid of the pop-ins, the whole map needs to be loaded when you start the game.
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