Why is Openstudio 1.14 simulation time twice as long as with EnergyPlus ?

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The reason this model is running slowly may be related to the 8.5 to 8.6 issue you identified in this post. It also has a number of very small zones with volumes less than 7 ft^3 that might be creating issues.

But we don't have an explanation for, nor have we been able to reproduce, the slowdown you were seeing between EnergyPlus 8.6 (run through the OpenStudio application) and EnergyPlus 8.6 (run through EP-Launch). I used your OSM file and downloaded the Santa Ana epw that your OSM seemed to refer to. I assume you didn't customize that weather file as it wasn't sent with your OSM.

Here is my runtime in OpenStudio 1.14.0 on mac
`Elapsed Time=01hr 43min 43.07sec'

And here is my runtime in EP-Launch-Lite 8.6 on mac
`Elapsed Time=01hr 50min 3.16sec'

In my case the OS app was actually a little quicker, but I was doing other work on my computer for the EP-Launch-Lite run, so that may have negatively impact the runtime by the 7 minute delta from the OS run. I'll update this if we come up with additional ideas on how to replicate what you see. Might be specific system configurations your your machine?

I tested the following cases on Windows 7 64bit and did not see any difference in the run times:

OS 1.14, run from app - Elapsed Time=02hr 35min 43.61sec
OS 1.14, export idf, run in EP_Launch - Elapsed Time=02hr 35min 14.80sec
OS 2.0,  run from app - Elapsed Time=02hr 35min 48.78sec
OS 2.0, export idf, run in EP_Launch - Elapsed Time=02hr 36min 44.26sec