Hi zicitron,
Based on your issue, as far as I know there is no options to adjust the speed of animation in Power View.
But I suggest you post your issue to Power View forum to get more help, maybe you can get result from Power View forum.
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Hope its helpful.
Regards,
George ZhaoTechNet Community Support