We are listing on eBay for 6 years now and we always used the API call AddFixedPriceItem.
Since the beginning, we were able to list around 6-7 items per second (around 150ms each).
For a couple of months now it's started to get slower and this is hurting our client business. Now each call takes around 3.5sec! I'm suspecting that this is since eBay added the required item specifics to the listings. Did anyone experience the same problem? There is something we can do or a reason for that? Thanks (We are using the .NET SDK with C#)