Docked mode is probably fucked unless they start dialing back on cpu requirements in their games.
Laying out the maths here, docking increases pixel count from 720p to 900p, a 56 per cent in resolution. However, memory bandwidth only rises by 20 per cent, from 1331MHz to 1600MHz. Bandwidth is shared between CPU and GPU, so the higher resolution in the home console mode may be sapping memory bandwidth away from the main processor cores, making us more prone to slowdown when the CPU is under load. Bandwidth concerns may also explain why resolution doesn't scale closer in line with the difference in clock-speeds (307.2MHz or 384MHz undocked, 768MHz docked). Suffice to say, if you're looking to play Breath of the Wild with minimal performance drops, running undocked is the way forward.