Small problem I've noticed with the way 2.9.11 manages its upload queue.

On my local installation, six upload slots are permitted. Commonly it will sit with 3 items uploading and the upload queue full. Items 5 and 6 on the queue do not seem to be allowed to start upload until item 4 has started.

Clients typically wait 1 minute before attempting to resume a queued download, leaving on average a 30 second gap between a slot becoming available and upload starting. Where files are of a size small enough to upload in less than half a minute, upload slots to become free more than once every 30 seconds. The net result of this is that of the six upload slots, typically only 2-3 are uploading while the queue sits full.

I would propose that, where N upload slots are free, requests to start upload from any of the top N items on the queue be honoured.

An option to adjust the maximum upload queue length would be handy to tinker with also.