When I create or modify an offer, I see a circling animation while all my items load.
Also, I see a counter of total items over to the right going up by 50 about every second. It takes about 20 seconds for my ~1200 items to load until I can add any. Even restricting the shown stuff to usable items which are only a tiny fraction in my shop does not accelerate the process.
Is it possible to expedite loading the inventory in any way? Maybe cache it and compare a timestamp against the last transaction?