I want to use SignalTap. When modified the SignalTap, the whole project needs to be recomplied which will take lots of time. I just want to recompile SignalTap part and don't recompile the oeiginal project. How will I realize it? Thanks

I checked 18.1, you can just used, Processing -> Start -> Start Rapid Recompile for it. The compilation for Signal tap by default should be using this anyway. The time had already reduced with the rapid recompiled. Otherwise, the full compilation will take even longer.