I installed the Windows 10 Creators Update and solved the problem.

Hi.

I have the same problem. SH3D has become slow, very slow, since the last Windows update, specifically were 3 updates:
1.- Windows 10 v1607 (KB4015217)
2.- Windows Malicious Software Removal Tool (KB890830)
3.- Adobe Flash Player v1607 for Windows 10 (KB4018483)

I'll really appreciate your help ...