Why has the 405 been comparatively tolerable this week?

I don’t know if this is just anecdotal but it seems like the traffic between 4-5pm has magically improved going northbound all of a sudden… for reference I enter at Alicia Parkway and exit at Harbor in Costa Mesa.

Usually it takes me around 35-40 minutes and it has been around half that this week in the four days I’ve taken it.

Did something happen/get completed that changed the traffic?