Mavericks vs Yosemite open/save dialog : Yosemite BUG

Hi,

I noticed a bug after upgrading from Mavericks to Yosemite regarding open/save dialogs.

I Googled this problem and find nothing related.

So I decided to make a comparison with fresh installs and latest updates:

- Mavericks 10.9.5

- Yosemite 10.10.2

Yosemite has clearly a performance bug on open/save dialogs.

On Mavericks, the animation is smooth and rapid.

On Yosemite, the animation lags and is not smooth at all.

I made a video on YouTube regarding this problem.

You can check it : http://youtu.be/t2WTaeKI3go

I would like to know if others have this problem and if there is a solution.

My configuration is :

MacBook Air 13" Mid-2011

1,7 GHz Intel Core i5

4 Go 1333 MHz DDR3

Intel HD Graphics 3000

SSD 256 Go