Replying to Shooting star timelapse

So yesterday was my first attempt at shooting a timelapse of the stars. Then I realized its a lot harder then it looks. I had my shutter at 8 seconds, f/4.0? And took a picture every 10 seconds. For some reason, the intervalometer couldn't keep up and the LCD on the camera kept saying BUSY. I was shooting such a long shutter because anything lower then that I couldn't really see the stars to well. Does anyone reccomend certain settings? Do I need to space out the time of the amount of pictures I take to every 20-30 seconds? Thanks and of course +K for help