This paper presents a methodology for the comparative performance analysis of the parsers developed for different grammar frameworks. For such a comparison, we need a common representation format of the parsing results since the representation of the parsing results depends on the grammar frameworks; hence they are not directly comparable to each other. We first convert the parsing result to a shallow CFG analysis by using an automatic tree converter based on synchronous grammars. The use of such a shallow representation as a common format has the advantage of reduced noise introduced by the conversion in comparison with the noise produced by the conversion to deeper representations. We compared an HPSG parser with several CFG parsers in our experiment and found that meaningful differences among the parsers’ performance can still be observed by such a shallow representation.