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Re:Emscripten - An LLVM-to-Javascript compiler by Zev on Sunday August 29, 2010 @06:04PM (#1644693)
FWIW, the author did somewhat touch on the issue of performance at the end of the article: Of course speed is an issue here. Emscriptened benchmarks currently run at about 1/20th the speed of gcc -O0 run on the original C++. and goes on to explain where the performance loss comes from.
Re:Emscripten - An LLVM-to-Javascript compiler by pohl on Sunday August 29, 2010 @06:21PM (#1644715)
Not terribly useful as comparisons go. GWT likes to compare itself to hand-written JavaScript, which tells a more practical story.