RDP connection to Windows XP

Hi there,

I'm connecting to a Windows XP SP3 via RDP and I'm experiencing slow monitor refresh rates whenever no user input is present.
I use a program with an animation and whenever I move my mouse or press a key (like 3-5 per second) the animation runs super smooth. No user input however slows down the animation to a point where I am not able to use the program efficiently anymore.

Is there a way to force the refresh rate to a maximum or to simulate the user input? I don't really want to sit there and spam a key all the time ;)

Thanks in advance,
Jan