To add to this:

Forest hills -> oak grove can be 3-5 minutes faster depending on the day

https://dashboard.transitmatters.org/rapidtransit?config=Orange,70001,70036,2022-08-01,2022-10-27

The opposite direction is slowly getting better, yesterday was 2 minutes slower than before shutdown

https://dashboard.transitmatters.org/rapidtransit?config=Orange,70036,70001,2022-08-01,2022-10-27

Although almost all of that delay is from Oak Grove to North Station

https://dashboard.transitmatters.org/rapidtransit?config=Orange,70036,70026,2022-08-01,2022-10-27

You can see it getting quicker on clear steps in here, not sure if that because of work they're still finishing or just extra precautions before ramping up the speed again.

North Station to Forrest hills is faster than pre shutdown by a couple minutes so it's really just that one section that's slower now

https://dashboard.transitmatters.org/rapidtransit?config=Orange,70026,70001,2022-08-01,2022-10-27