Here is a cool tool for you, I found a tool that could help you monitor performance for many URLs as you want and from different locations around the glob with waterfall charts for each URL and a video recording to see what actually your visitors see called (https://dotcom-tools.com). check it out
I am new here, and i am open to have friendships with you guys so if you have any issue i could help you with, don’t hesitate to contact me.