Okay time to improve performances, gprof session:

before  real 0m2.483s (2.3.2 release yesterday)
current real 0m1.763s
when parsing (with tree build/freeing) db10000.xml from XSLTMark:
- xmlmemory.h HTMLparser.c HTMLtree.c entities.c parser.c
  xpath.c xpointer.c tree.c uri.c valid.c xinclude.c xmlIO.c:
  avoiding memcpy in production builds MEM_CLEANUP macro use
- parser.[ch] parserInternals.c: optimizations of the tightest
  internal loops inside the parser. Better checking of I/O
  flushing/loading conditions
- xmllint.c : added --timing
Daniel

xpointer.c

@@ -715,15 +715,11 @@ xmlXPtrFreeLocationSet(xmlLocationSetPtr obj) {
 	for (i = 0;i < obj->locNr; i++) {
             xmlXPathFreeObject(obj->locTab[i]);
 	}
-#ifdef DEBUG
-	memset(obj->locTab, 0xB ,
+	MEM_CLEANUP(obj->locTab,
 	       (size_t) sizeof(xmlXPathObjectPtr) * obj->locMax);
-#endif
 	xmlFree(obj->locTab);
     }
-#ifdef DEBUG
-    memset(obj, 0xB , (size_t) sizeof(xmlLocationSet));
-#endif
+    MEM_CLEANUP(obj, (size_t) sizeof(xmlLocationSet));
     xmlFree(obj);
 }