回複：some analysis about that

For Chinese, there are only 2812 visa quote for each EB catergory every year.
According to some reliable reports on name check issures, there are more than 60000 name check pending for more than 2 years (not 6 months, but 2 years) world wide. I think a significant fraction are for Chinese applicants amoung those 60000 people ( which meaning more than 100000 for pending more than 6 months).
If the personel in DOS are not terrible at maths, I would expect a serious retrogression on EB2 and a priorty date on EB1 soon.