UPDATE3: Cross-save and Graphic Options in English, and Update 3.6 patch notes:
- Added touch control support.
- Added save file integration with GOG, Steam and versions of the game for Switch from different regions.
- Added more text languages (in selected regions).
- Added more graphical options.
- Added multiple performance optimizations.
- Fixed various visual and functional bugs.
- Various gameplay and crash fixes.

UPDATE2: Game update started to roll out worldwide, also in Italy as seen in the comments over at NE.

UPDATE1: An update seems to have started rolling out, players in Korea are allegedly able to download version 3.6. The update appears to be as significant as was hinted at. Saves now have compatibility with the PC version, meaning you can progress through the Switch edition and continue on where you left off on Steam (and supposedly GOG) and vice versa. Additionally, it looks like several graphics options can be tinkered with.

Based on the reddit post, there are eight new graphic FX options available:

- Motion blur
- Blur effect
- Bloom
- Sharpen
- Depth of Field
- Depth of Field for Cut-scenes
- Chromatic Aberration
- Water Quality
- Foliage Visibility Range
- Anti-Aliasing

And following are two screenshots comparing Sharpen OFF vs MAX.

Source

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Enhanced settings? Boosted resolution? 60FPS?

With a modified Switch in hand, the doors blow wide open when it comes to squeezing more from its games library. The Witcher 3 benefits in many ways - solving many of the gripes we experienced in the base game. Now we can overclock the system to hit higher frame-rates, and even apply user-made mods to boost image quality and visuals. But at what cost?

https://www.youtube.com/watch?v=sPViMidRJxY

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I knew you could overclock CPU and GPU to help DRS, what I didn't know is that you can mod the game to change settings.

Improve visuals or image quality, increase that foliage range or sharpen that image, all possible at a cost on performance:
- Bloom
- Sharpening
- Depth of Field (both gameplay and cutscenes)
- Light Shafts
- Underwater Effects
- Foliage Visibility Range (it doesn't change ring size, because this is adjusted dynamically)
- Water Quality (which is just disabling/enabling (default) physics simulation when swimming, changing tesselation factor doesn't work)
- Anti-aliasing (which is technically TAA, but it doesn't have any string related to it, so I've used antialiasing string)

https://www.reddit.com/r/SwitchHaxing/comments/dhml03/the_witcher_3_enhanced_settings_mod/

And here is a comparison of the mods

http://www.framecompare.com/image-compare/screenshotcomparison/J00JMNNU

It's worth noting though that modding one's system doesn't come without risk; you could brick it in the process, and running overclocked will likely shorten its lifespan.

True, but I thought you out of all people would enjoy playing with these settings.

If you play with fire, you get burnt! 

Or like we say in Spain: who plays with fire, pisses in bed...

I'd be too scared of breaking my Switch to mess with it tbh. XD

Cheers for thinking of me though. :) This is indeed interesting stuff.

It can run the original spec, aka Nvidia Shield. Nintendo lowered it for battery, people have OC'd the consoles ages ago and found good performance increases. Overclocking the memory alone brings gains.

For handheld mode, yeah, that makes sense. 

But for docked mode, why limit GPU clocks to 768MHz for no reason when battery life isn't a factor?

I always wondered that.

If anything I find the opposite far more common, the whole "it looks great on the small screen but not so much when you blow it up on a big TV". 

I very doubt anyone would be complaining if in docked mode the GPU ran 20% faster at the Shield's 921MHz clock, allowing for better resolutions in TV mode, where it's more often compared unfavorably to stronger TV-only consoles.

I don't see anyone bashing portable mode. And this is just one small thread on a niche enthusiast forum, its hardly indicative of how the wider consumer base sees the situation. I can't imagine there'd be many complaints at all if Switch stayed as it was in portable mode but ran just a little better when docked. 

So I don't see that as a plausible explanation at all, Nintendo must have had some other incentive to downclock the GPU below the Shield in docked mode. Maybe just to play it on the super safe side in terms of longevity and overheating?

Wait actually I remember this now; if I recall correctly, in the Shield the GPU thermally throttles down to 768MHz when it heats up anyway, so Nintendo just capped it at that for consistency.