I've used gdb to find that in functions_vbenterprisetranslator_vbseo.php, there's a regular expression that seems to be segmenting my server. We're talking about 5-10 segmentations per minute.
It's not vBET's fault directily, as it's being caused by a bug by PCRE, but is there any way you can rewrite the regular expressions used to be a little less taxing in terms of recursion depth?