hi
i have a problem with xdebug on a FreeBSD server. on that server xdebug profiler's cachegrind files say that executing time of native functions (such as DOMDocument::load() or XSLTStylesheet::importStylesheet) is about 50% of total script execution time. and with profiler turned off those functions work for less than 0.1%
on my own Ubuntu computer there are no such deviations in profiler output, so i think the problem is connected with some configuration-specific issues