Wait times for US green card

HI,
I am a US citizen living in UK. Have applied for a green card for my spouse via form I130 and found that the wait time is around 18 months as of today. Does the wait time improve? Should I apply for a K3 visa to expedite entry to the US? IS this process any faster? Thanks.

Can't help you with your specific question, and I assume you probably already have this link, but in case not:

https://egov.uscis.gov/processing-times/

18 months seems pretty speedy.

Yes I do. Thanks!