WIP Try to improve Report generation performance

[hoechenberger]

Currently this is really just here for @agramfort and won't be of interest to anyone else

[bloyl]

hi @hoechenberger,

Firstly, I really like the new reporting functionality. So thank you for that effort.

I wonder if there is any opportunity to also support the following for add_raw

1. Adjust the 1 second interval to longer (or shorter I guess ) time intervals.
2. Adjust the scaling on the raw butterfly plots.
   For my base CTF data it is often off the scale.

Maybe collapsed into a butterfly_kwargs argument or something similar?

Best,
Luke

[hoechenberger]

Hello @bloyl, Report.add_raw() now has a scalings parameter: #10109

Currently we don't support a way to specify custom durations