Way to much cpu load because of background panning in default Mint-X html theme

Please remove the background panning in Mint-X theme, because it eats up loads of cpu.

On my machine cpu usage goes up to 100% with the propietary AMD Catalyst driver (for Radeon HD6870) and around 20% with the newest mesa git and kernel 3.12. With the propietary driver the login screen even gets unresponsive when selecting the user and typing the password.