Load Time - is its definition changed or calculated differently?

Hi,

I am seeing that the metrics “Load Time” offsets a lot for our homepage comparing the waterfall on July 9th to that on October 18th. Is it a recent definition and calculation change, or some issue in our page or even WPT?

Noticed that the “loadEvent” timing looks pretty consistent in the two different tests.

Here’s an example.
Before:
https://webpagetest.org/result/190709_PE_b46d4286b3c4db0a256204ac91c3e686/1/details/#waterfall_view_step1

Today:
https://webpagetest.org/result/191018_SV_29141ff1b2a15d75db5a3bf5906cd70d/1/details/#waterfall_view_step1