Nexus 10 is a 2GB RAM.
However, the device has 1GB of information.
Where are the rest of the 1GB of RAM?
Both running 4.2.2 - The video was very laggy in both devices, in S4 it was completely unwatchable. On Nexus 10 you could watch it, but it was very unpleasant.
Both running 4.3 - The video got a little better on S4, you could watch it, but some parts were uncomfortable and really laggy. Nexus 10 got an amazing improvement (that's when Google started to allocate RAM to the GPU), you could watch it almost flawlessly, the only problem was skipping some parts and one particular scene.
My S4 broke, and now I'm with a Xperia Z1. Xperia Z1 and Nexus 10 running KitKat - Xperia Z1 performance was perfect, no lag at all, all scenes watchable and no problems rewind and fast forwarding the video, Snapdragon 800 has an amazing GPU indeed. Nexus 10, being one year older than Z1 with a older processor and way more pixels had a similar performance, was way better than on 4.3, the problem was with rewinding and fast forwarding, other than that was perfectly fine.
I already answered this question many times, but here it is again:
Like you already know the Nexus 10 powers up a huge resolution display, and the graphics processor is not really able to keep up with it all alone, so Google allocated some of Nexus 10 RAM to the GPU. The update brings some new stuff, therefore requires more power and as such it will probably need more GPU power as well, and that's why you see less RAM. I will share here how I tested each update based on graphical performance:
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