Dev Mode results in 'spinning wheel' delays on Mac

I'm using GWT 2.4 I find that after I launch dev (hosted) mode, which
itself takes around 30 seconds, the first page load comes up fine.
But if I start editing java files and do a browser refresh, I find
that very soon the browser refresh starts 'hanging', and I get the
dreaded spinning wheel pointer icon on the mac. It doesn't matter if
I use Firefox or Safari, after the first few changes the subsequent
browser refresh takes forever to complete.

Do other people experience this problem when using Dev mode? Are
there things I can do/configure to work around this unfortunate
performance problem?

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