Lagging and Weird Glossy Object

I found the file become super lag suddenly. And the object turn very glossy in shaded mode but I didn’t change any setting. Also, the glass material also turn transparent in shaded mode which is not the default setting I got. Noted that the file is just 450Mb. Any idea?

Hi Jack- I am taking a look - note you have posted your file in a publically accessible link - is that what you intended?
The posted file is missing many many blocks so it may not show the problem - it seems OK here.


Oh yeah I forget those linked block. The problem is fixed now after I turned off my cpu for some time, maybe it is a little bit overwhelming. Thanks