What pacing problems for the DM does Murder in Baldur’s Gate pose when running the adventure?

This question is directed at DM/GMs who have run the adventure Murder in Baldur’s Gate.

I am prepping to run this adventure, and it seems that this module’s ten phase / three faction plot structure makes for a variety of player and DM decision points and interaction with arbitrary sized groups of NPCs.

My objective is to do pre-emptive decision point preparation so that encounter size, pace, timing and CR all fit the plot. I’d like to use lessons learned from those who have run this adventure by identifying those points that most often slowed play down. (Once identified, mitigation can be applied).

I intend to run this in D&D 5e, but experience with pacing issues and their resolution in a 4e or 3.5 context should be highly relevant and are acceptable as answers.

If, as a DM, you ran this module/adventure during or after the playtest:

What pacing/adventure flow problems did you encounter as a DM when running the adventure, and how did you resolve them?