FileZilla Simultaneous Transfer Limit and Directory Listing Concurrency

Goal

Determine whether FileZilla’s configured maximum simultaneous transfers also governs the number of concurrent directory listing operations (LIST/MLSD) when navigating remote folders, or whether listings use a separate channel that does not consume transfer slots.

Constraints and Uncertainty

The documentation describes the limit as applying to file transfers and the queue system, but does not explicitly state how directory listings are counted. Behavior may differ between FTP and SFTP, and high‑file‑count servers sometimes exhibit listing timeouts that could be influenced by this setting.

Understanding this interaction is important for avoiding unnecessary bans or timeouts when adjusting the transfer limit on busy servers.

1. Does each directory listing operation occupy a transfer slot under the “Maximum simultaneous transfers” setting?
2. If listings are exempt, how are they scheduled relative to queued file transfers?
3. Can adjusting the simultaneous transfers limit mitigate listing timeout occurrences on servers with extremely high file counts?