How to determine specific slow step in reading tables

[B_Reyes]

Hi all! Starting this August, I'm getting reports of slow syncing from my app, when I went to my performance analyzer, I can only see this report:

What I can't understand is WHY its reading the tables for a long time when it was working well before August and no changes has been made. Can someone point me at what I'm missing here? Thank you in advance!