As I wrote already parallel transfers are not supported in scripting. Nor you can control the GUI queue from a command-line..
You can though create a number of batches (with different sets of websites) and run those in parallel.
See https://winscp.net/eng/docs/library_example_parallel_transfers
And my answer on https://superuser.com/q/1035146/213663#1036128
You can though create a number of batches (with different sets of websites) and run those in parallel.
See https://winscp.net/eng/docs/library_example_parallel_transfers
And my answer on https://superuser.com/q/1035146/213663#1036128