Bug 13479 - Xamarin.Studio Build speed problem
Summary: Xamarin.Studio Build speed problem
Status: NEW
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Project Model ()
Version: 4.0.10
Hardware: PC Windows
: Normal normal
Target Milestone: master
Assignee: Lluis Sanchez
Depends on:
Reported: 2013-07-25 14:25 UTC by Philippe Monteil
Modified: 2013-11-26 11:12 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

the solution as it appears in Xamarin.Studio (153.07 KB, application/x-zip-compressed)
2013-07-25 14:25 UTC, Philippe Monteil
a pair of similar VS.Net / Xamarin.Android solutions illustrating the build speed problem (2.85 MB, application/x-zip-compressed)
2013-07-25 15:05 UTC, Philippe Monteil

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Description Philippe Monteil 2013-07-25 14:25:16 UTC
Created attachment 4436 [details]
the solution as it appears in Xamarin.Studio

Description of Problem:

I am working on a project taking the form of a solution made of about 30 library projects
and a number of test and utility applications.

Some of the projects make reference to a larger number of lower level assemblies.

Compiling those highly dependent projects takes up 12+ seconds on my iMac, depending on the number of their references,
even when he build involves no compilation of their source files.

I also have WPF/W8 VS.Net 2012 versions of the solution, and
the same operations on the equivalent projects are much faster.
Building the complete solution when it is uptodate takes no time with VS.Net
and about 15s with Xamarin.Studio.

This friction is due to the fact that when a project is compiled, its refererenced projects are checked each time.
Building the solution makes many of its projects be checked several times, up to 7 times for some of them.
I have tried replacing the references to projects by references to the assemblies they produce, and the update time
of the complete solution then goes down to 2-3 seconds.

This causes a real productivity problem when working on quite big projects like mine.

Wouldn't it be possible to propose a 'fast build mode' which would consider not the referenced projects but the assemblies
they produce when building/checking a solution or one of its projects?
Comment 1 Philippe Monteil 2013-07-25 15:05:24 UTC
Created attachment 4437 [details]
a pair of similar VS.Net / Xamarin.Android solutions illustrating the build speed problem
Comment 2 Philippe Monteil 2013-07-26 02:36:39 UTC
I have made more tests against similar solutions using Xamarin.Studio 4.0.10 on OSX
- MonoMac and Xamarin.iOS: the build process is very fast
- Xamarin.Android: same very low speed problem as on Windows