"Keep digital graphs constructed" - what is it for?

[McBainUK]

From the 1.5.31 beta available (6th September) Announcement thread:

added a setting to force digital graphs to stay constructed, giving slightly quicker live tv / recording startup times, and to hopefully work around a problem with HDHR device.

If it speeds things up why would it be an option and unticked by default...?

[elbryyan]

I often wondered what it was for myself but was afraid to check it for fear of messing stuff up.

[johnsonx42]

the HDHR issue that it worked around has been fixed. a day or two ago we discovered that it was actually causing a problem for wtg - his graphs would appear to go stale somehow overnight, possibly during the EPG update, so then when a recording started in the morning, nothing would record. unticking the option solved his problem.
building a new graph every time and tearing it down when done seems to be most reliable.

[McBainUK]

So the summary is that it's more reliable, but slower. Is there a particular scenario where it's unbearably slow?

[sub]

I'd suggest no one uses "Keep digital graphs constructed". I'll probably remove it in the next release.

It was only added to work around an HDHomeRun issues, but ended up not being needed for this.