@164Morhf the answer is a bit more complicated. On the paper, Manager has no practical limits but performance will start degrading once you hit 10k invoices. Performance degration will be so subtle, you can’t notice it. I think by the time you hit 50k-100k invoices, it will be noticable.
There are quite a few heavy users on cloud edition. Typically I’m looking into bottlenecks and trying to figure out how to improve the performance based on specific circumstances. Also, computers are getting faster so that helps too.
At the end of the day, Manager is still general-purpose accounting system. If you make 1,000 sales per day. Do not enter them in Manager individually. You should be using special-purpose system for that like point-of-sale system which is better suitable for rapid data entry. Then enter sumarizing entries from point-of-sale system into Manager.