Slow FTP connection behind F5

Sorry I forgot that people indeed use the DNS name for this public IP, but I realized all my tests with the public IP directly and had the same issue.

I made some intensive tests and the issue seems to be related to the server behind because everyone always have these delays when connecting to this specific FTP service.

Our windows team is now investigating, therefore this topic can be forgotten and offered to Chtulhu :D

Thanks for your suggestions :)