Last night, The Legend of Zelda: Breath of the Wild was updated with a new patch for Nintendo Switch and Wii U. Patch 1.11 is a quick 167 MB download and the patch notes are pretty sparse on what has actually been updated with this patch.
Adjustments have been made to make for a more pleasant gaming experience.
Since the patch notes were pretty bad, the Zelda community has been vaguely flailing in the dark as to whether the patch is purely for graphical tweaks, or if there were other improvements made. There's a bit of placebo effect going on in some parts of the community, with other potential improvements ranging from changed level of detail, to tweaked object pop-in, lowered fog, and even improved load times.
Most fans who have been playing the game post-patch have been reporting better frame rates, especially in the game's most troubled spots. Korok Forest, which is a place that can consistently cause severe frame rate drops, is much better post-patch. It's still not smooth; as you step closer to certain spots, the frame rate still drops off a cliff, but it's better.
People are still trying to figure out how Nintendo improved the frame rate, either from a change in the dynamic resolution, upgrade in internal clock speed, or simply a slight downgrade in the game's graphic settings.
I'm sure the folks over at Digital Foundry will be diving into the game to see where the changes have been made. Until then, let's just be glad that Breath of the Wild is being improved.