GWT Compilation Out Of Memory

GWT version: 2.6.1
Browser (with version): any
Operating System: Windows

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My Application is producing 1.6GB of war file and taking 7 to 8 hrs. for complete build of 5 permutation.
configuration of machine on which we are compiling is:
OS: windows server 2012 R2
RAM: 64GB
Processor: Intel R ZEON R CPU E3-1225 V5
Core : 4

we have defined gwt compile parameters as follows:
GWT Compiler JVM Arguments: -Xmx61440M
GWT Dev Mode JVM Arguments: -Xmx61440M
GWT Test JVM Arguments: -Xmx61440M

we are facing two major problems:

1. from last few days we are receiving out of memory error during compilation.
2. it is taking very huge time to build.

we wish our project could break into smaller sections (modules compiled individually separately) and bundled in a single war at the time of release. like we use multiple dlls and use it in single exe. and in case of changes in any dll we need not to build whole exe again instead we only compile a dll and deploy it to client.

any suggestion \ help will be highly appreciated.

thank you!

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