How Many Creatives Are You Testing at Once?

I’m trying to optimize my creative testing process. Previously, I usually tested a few creatives at a time and eliminated them based on the data. However, recently I feel that ad lifecycles are becoming shorter, and creatives need to be refreshed more frequently.

How many creatives do you usually test at once? And between video creatives and image creatives, which one has been more stable in performance? I will consider any suggestions. Thank everyone in advance.