If my application which base on slicer, need many qMRMLThreeDWidget, may be more than 10 qMRMLThreeDWidget. Is this will degrade the window rendering perfermence? and how do i do? Thanks for your help!
There will certainly be overhead but exactly how much depends on the data and how often you update it. The best thing to do is make a small example script and see how it performs. Use a profiling tool if you can to see where the application is spending time.