Is there a variation that load shares between the GPU and CPU? Or is this a one or the other thing?
No. I use the GPU as URL 1 Jetsun as 2 and CPU as 3 and have Queued unchecked.
To quote Chris;
This is the way the queuing system works right now:
If only one image is in the queue and you have "Queued" checked in Settings the URL's take turns:
1. Image 1 in queue gets sent to URL 1
2. Image 1 in queue gets sent to URL 2
3. Image 1 in queue gets sent to URL 3
If more than one image is in the queue and you have "Queued" checked in Settings:
1. Image 1 in queue gets sent to URL 1
2. Image 2 in queue gets sent to URL 2
3. Image 3 in queue gets sent to URL 3 (or waits until a URL is available and takes them in order)
If "Queued" is not checked, then only the first URL will be used UNLESS it is busy in which case
the next URL in line will be used only if needed.