Rhino 7.29 update shading problem

Hi all. After I have updated my rhino to 7.29 , the shading went completely off. Showing some weird texture which I have not applied. Also the files are also extremely lagging when I try to orbit the view. I am wondering how can I resolve this problem? Now it’s almost impossible for me to work. Thanks a lot, please checked the attached photos.

Updating to the latest 7.30 Release Candidate should fix the weird shading problem which was introduced in the previous 7.29. On the other hand, I am not sure that was the cause of any lagginess, so something else might be going on with your file.

Thanks! Where can I download the 7.30 version?