No, it's not. The animations add no information that isn't conveyed by the graph already--it just creates a delay before you can see the information. And changing the behavior of core functionality like the keyboard/pointer will confuse people, and on this page there is nothing to be gained in return.

I like that the animations allow you to follow the trend without much effort of finding the appropriate lines. It's clear, just fast enough, and works smoothly at least on my browser. At the very least, your claims are definitely subjective in terms of usability.

I think the animations do add some spatio-temporal information. Different states get highlighted at different times as the line graph progresses. I can't claim to know much about front-end design but I liked the animations.

I too hate when i don't get to use my computer as i see fit, but you have to admit that every point you have mad, previous to the comment i am responding to now, has been made from a personal, preferential point of view. I am not saying i do not agree with; i am saying its just, like, your opinion man.

You can make objective conclusions about subjective preferences. Most users do not want to wait to see information being presented to them. Nor do most users want to deal with websites that randomly change how their computer works. The distribution of subjective preferences can make design decisions objectively bad.

fair point

Ease of use in this case is not subjective.

If you're going to present a graph, the point of that graph is to be understood so it needs to be read easily and promptly.

Animating the graph every time you move up or down the page gets in the way of that analysis. It erases the data you were about to look and forces you to wait needlessly for it to appear again.

Try to look at one graph and quickly go back to a previous one to check it out in comparison or anything. It's absolutely uncomfortable.

It's about graphs. Their whole purpose is usability, and usability is almost entirely subjective.