AFAICT the amount of GWT modules shouldn't noticeably influence the 
compilation time.

What increases compilation time is lines of code obviously, the amount of 
permutations that need to be compiled (for example I18n can produce lots of 
permutations), wether or not you use more than one worker during 
compilation (parameter -localWorkers) and finally outdated CPUs and RAM 
shortage (GWT developers should have decent machines to work with, not that 
5 year old 3GB Windows 7 notebook).

So for production builds or test builds you probably don't care about the 
compile time as these builds are done on build servers anyways. For the 
occasional development compiles you can decrease compilation time by 
limiting permutations to a single one and skip most optimizations by using 
the -draftCompile parameter.

How many lines of client side GWT code does your app have and how many 
permutations do you produce? A compile time of 8-12 minutes doesn't sound 
too unreasonable if the app is already large or has lots of permutations.


-- J.

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