Change in 90 day reporting at Imperial World Mall (Big C Ladprao Soi 83, 5th floor).
Before when foreigners went to this location to do a 90 day report we had our own "window" (A2) and it was a very fast process.
Now we take a queue number and wait in line with the burmese, cambodians and laotians who are also doing their 90 day reporting. FWIW: it still moves pretty fast though.
Remember foreigners in Bangkok can do a 90 day report at three locations;
-Main Immigration Office (gov't complex Chaengwattana Road Building B)
-Imperial World Mall (Big C Ladprao Soi 83, 5th floor)
-Big C Ratburana Road (across the river in Thonburi
The main one is open 8:00-16:30 closed from 12-13 for lunch
The other two are open from 10:30-18:30 (sorry I forgot the exact times they are closed for lunch).
TLDR : Answer Summary
The process for 90-day reporting in Bangkok has changed, particularly at Imperial World Mall, where foreigners now share the reporting area with other nationalities after previously having a dedicated 'foreigner' window. Despite this change, the reporting process remains efficient, although foreigners may have to take a queue number and wait slightly longer than before. Three locations are available for reporting: the Main Immigration Office, Imperial World Mall, and Big C Ratburana Road, with respective hours of operation noted.