Active tab border "twitches" instead of appearing smoothly about react-mdl HOT 6 CLOSED

What do you mean exactly? Providing an animated gif/video would help I think ;)

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Here is the video: https://www.dropbox.com/s/mrmxm64ibr4z7v3/20150909-233330.mkv?dl=0

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Yeah I remember seeing this as well, but it's a upstream issue. On the getmdl website, you can also reproduce it.
They also said the animation was not right and I think they think about changing it to match what the material design describes.

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But there's no such issue at MDL website: http://www.getmdl.io/components/index.html#layout-section/tabs

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I do have the same issue on my side, I opened an issue about it on the mdl repo a few weeks ago. They closed it because it was linked to another issue mentioning the animation is not correct.
See this google/material-design-lite#1335

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Upstream issue, see google/material-design-lite#954

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