Firestore queries taking a long time for a new field in document

Based on the troubleshooting we did in the comments, deleting the local cache fixed the problem. So it sounds like:

• your queries were running locally
• you had a significant amount of data in the local cache
• you likely don't have local indexes defined to support those queries

In this case the SDK has to do a scan of the local data, which is gonna be some big O (specifics depend on the platform) and can take significant time.

The first steps I'd take is:

• Ensure that you have configured the necessary indexes for your offline queries. This might solve the problem right away.

• Consider having only data in the local cache that the user is likely to see. If some data is not likely to ever be displayed, as a user I'd prefer to not download that data to my device.