FS-4928 doing 100 calls I found 7 million calls to toupper, this patch replaces it with an inline optimized one I found online. Not sure it helps but maybe you can profile it again with latest.

src/switch_utils.c

@@ -2609,7 +2609,7 @@ const short _switch_C_toupper_[1 + SWITCH_CTYPE_NUM_CHARS] = {
 
 const short *_switch_toupper_tab_ = _switch_C_toupper_;
 
-SWITCH_DECLARE(int) switch_toupper(int c)
+SWITCH_DECLARE(int) old_switch_toupper(int c)
 {
 	if ((unsigned int) c > 255)
 		return (c);