Why is my processing.exe open so slow?

When I open processing, it’s very slow. It will takes 60+ second to enter coding editor interface from welcome interface.
And after I hit “Run” buttom, it will get stuck and running canvas never comes out, even with the most simply code.
A week ago it works very well but now it becomes unusable. Reinstall doesn’t work. How to fix that?

I think maybe here has the answer. I’m trying.