USCIS processing times have slowed considerably in the last year. Recently, USCIS has announced a processing methodology change which is going to be implemented in April. This will result in reduced waiting times for almost all nationalities, save for the Chinese. Washington DC based Immigration lawyers Donoso & Partners LLC have drafted an article on this update:
USCIS hasn’t updated its processing time chart yet; we will surely post a news item on this issue once it occurs. This new methodology should result in a quicker I-526 adjudication.