I believe due to the new "extreme vetting" (without enough additional funding) backing up the whole immigration system. Unfortunately there's no getting around

I believe due to the new "extreme vetting" (without enough additional funding) backing up the whole immigration system. Unfortunately there's no getting around that since all the vetting is done in the US and there's very few exceptions for faster processing. The vetting has always been a major bottleneck in the US's immigration processing, it is just even worse now.