Not much related to memory I think. Sure, more memory helps, but there are 
other things to check, the most important probably being:

1. reduce the DevMode classpath to the minimum necessary. One common 
mistake (which the GPE or "mvn gwt:run" do by default, but they technically 
cannot do otherwise due to limitations of Eclipse and Maven) is to include 
server-side dependencies in the classpath for the DevMode: server-side code 
are loaded from the WEB-INF, like in any webapp, they don't need to be on 
the classpath for the servlet-container (you're not tweaking the classpath 
for Tomcat –or whatever your servlet container– when deploying a new 
webapp, right?)

2. use a fast I/O: an SSD, or even a ramdisk. (honestly, I've never done 
that, but I've heard many people saying it really helps)

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