I happened to write a paper trying to answer this question. It describes an experiment that consisted of writing PEG for Java 1.5, transcribing it into a directly executable parser, and measuring performance of that parser. The paper, in a gzipped postscript form, can be found at http://home.swipnet.se/redz/roman/papers/Parsing.ps.ps . I expect it to appear in Fundamenta Informaticae this spring. A preliminary version has been presented at the CS&P'2006 workshop in Wandlitz, Germany. The Java grammar I used is at http://home.swipnet.se/redz/roman/papers/PEG.Java.1.5.txt .
Roman Redziejowski http://home.swipnet.se/redz/roman/
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