This either sounds like a slow computer or a lot of programs running in the background of your machine.
Try turning off everything that is running in the background of your computer by shutting down everything that isn't critical in your "system tray." What I am referring to is all the little icons in the lower right hand corner. These programs start when you turn on your computer. Right click on each icon and shut it down.
The other thing could have to do with how much and what type of RAM you are using. Spitting video should be almost instantaneous, and if you have to wait 20 seconds for this to happen, you may not have enough memory, your computer may be slow, or you may have lots of spyware on your machine that needs to be cleared out.
What sort of computer setup do you have?