They're horrible.
Don't get me wrong, the fact that it takes a lot less time to finish a synth is great and that should stay. There's two ways to fix the animations. There's the common sense way which actually looks good and then there's the "quick fix" which looks absolutely awful and completely unnatural. They took the latter approach. I am hoping this is temporary.
The better approach would have been, instead of sawing maybe 4 times you saw twice, at the same speed. Have you guys seen armorer? I am hitting metal like 10 times or more a second. It looks ridiculous and outright silly.
Please bring back the original speed to the animations by 2.0, just cut down the length of them. This is a major put-off to crafting, considering one of the biggest charms of this game is the eye candy in its graphics and animations, and this is a complete step backwards.