What does a 4.5 second POST tr/ from Facebook mean?

Technical Q&A
1

I dont know what this POST tr/ from facebook is. Can anyone help?

Screenshot 2023-01-04 at 3.12.29 PM.png
Screenshot 2023-01-04 at 3.12.29 PM.png2672×1486 509 KB

Screenshot 2023-01-04 at 3.37.10 PM.png
Screenshot 2023-01-04 at 3.37.10 PM.png2736×1330 360 KB