> https://github.com/kripken/emscripten/issues/2970 
<https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fkripken%2Femscripten%2Fissues%2F2970&sa=D&sntz=1&usg=AFQjCNFXnYTP-F1k44182kLHz4NkFRGetg>
> To be honest I haven't tried source maps on huge projects. It's very 
possible there is a large inefficiency somewhere. Filing an issue with a 
testcase would help investigate.

I've seen that one before, and it's the same issue.  Seems like he's posted 
a test case already.

I wouldn't say my tests are on huge projects.  It's easy to see this in the 
Activity Monitor when the linker goes off for minutes, and the GB just keep 
increasing.  I think we just passed 8GB with -g4 on non-debug builds.   
This is the single biggest slowdown on links.  It's not the optimizer.  If 
you remove -g4, the link times are down to 1 minute or less.  With it, they 
are more like 5-8 minutes on a quad core system with SSD.

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