Hot Flashes Menu and tablets/phones

The animation when switching buttons are not working well on tablets and phones. Is this a compability problem between menu and browser, or is there something else in my template that causes it? Can it be solved or should I use a dedicated template for mobile useers? See www.hovmedia.no

Optimizing pictures can make it better. Devices processors are not powerful as one on your desktop computer and often not have aux graphic accelerators so for example animation of transparen .pnp image can slow it down