Eli Zaretskii <eliz@gnu.org> writes:

> Ping!  How can we make some progress in this matter?

Sorry for the delay, I have been very busy and have not had time to
respond.

I tried using `pre-redisplay-functions`, but performance was worse.

I was able to mitigate the poor performance by removing the indicators
for comment blocks (that implementation was broken and very slow) and
adding a limit for the indicators.

I also tried using the new feature in larger files for a while to test
its performance (since there were no volunteers), and from what I've
tested, it is stable.

At the moment, the implementation can now be installed.