File search is sometimes slow / unresponsive (Dropbox and the File Provider API?)

Hi - I'm using Alfred on three different Macs. The three systems are basically the same, all running Alfred 5.5 with macOS 14.4 on an Apple M1 or M2. My files are synced across the three via Dropbox. On one of them, I have updated Dropbox to use the "File Provider" API; on the other two, I'm still using the older sync method. On the updated one, Alfred's file search is often quite slow to return results and sometimes completely fails to return anything. The other two systems do not have this problem, which makes me think that it must be somehow related to Dropbox. The problem is irregular, making it hard to pin down. I have fiddled with Alfred's settings and rebuilt the Spotlight index more than once, but it hasn't really helped. This has made me quite reluctant to update Dropbox on the other two systems, but eventually I will have to. Any thoughts / suggestions would be greatly appreciated? Thanks!