Recently it seems that a lot of files are transferred to Beijing VO, so it might take longer than other VOs?
There are periodic comments here from applicants who have heard from the call centre agents (or MPs, or others perhaps?) that Beijing and possibly some other offices are fulfilling a 'support' or secondary role (blah blah digitilization something).
It could be that this is just incorrect information from the call centre agents - no way to know.
Or it could be accurate that some other visa office is really the 'primary' office (presumably meaning makes the final decision).
Meaning: it's possible the waiting or queues or time delays* don't mean that Beijing is particularly busy - but that ultimately it's the same limited throughput at whatever office is responsible, somewhere else in the world.
*Not clear to me that all of these are 'delayed' actually, some seem like more or less in normal time frame, at least from perspective of when AOR/med and biometric requests were done.