TTLB is time to last byte. It is the total time it takes for a PC to receive a requested page, from start to finish. I use the "app.telemetry Page Speed Monitor" add-on for Firefox. I just got this page from iHub, https://investorshub.advfn.com/boards/read_msg.aspx?message_id=154871132 and the add-on shows me 5.81 seconds as the TTLB: investorshub.advfn.com/uimage/uploads/2020/4/7/cgodrScreenshot_-_4_7_2020_,_07_20_26_PM.png