Amazon S3 find is very slow

Trying to find a file under a bucket is very very slow compared to aws cli (Minutes vs, seconds)
I compared it with the following command (windows):
aws s3 ls --recursive s3://<bucket>/ | findstr <filename>

Yes, that's quite likely. WinSCP Find Files command is protocol agnostic and hence cannot take advantage of recursive search API of S3.

It would be very complicated to change that. Let's see if there's a demand for that.