Wrong upload / download speed (Nginx / Webdav / Client)

I have a problem with the upload / download speed. Let me tell you. I have Seafile in version 8.0.X. My internet line has a speed of 300/300 Mb.

Webdav Cyberduck
Upload → 300 Mb
Download–> 300 Mb

Webdav Other Client
Upload → 40 Mb
Download–> 300 Mb

Edge/Chrome/Firefox
Upload → The speed ranges from 100 Mb to 10 Mb. 2 seconds goes up to 100 Mb and 2 seconds goes up to approximately 10Mb. Mb
Download–> 300 Mb

Client Seafile Windows
Upload → 300 Mb
Download–> 300 Mb

Client Seafile Mobile
Upload → 20 Mb
Download–> 300 Mb

In short, the biggest problem is with file uploads. I think the problem may be in Nginx, but I do not know what may be happening or how to verify it. I appreciate your help.

Thank you.!