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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/48175

Too expensive for the acl operation?
{{{
$ egrep _re_ acl/*.[ch]
acl/acl.c:	re = slapi_re_comp( pat, &re_result );
acl/acl.c:	/* slapi_re_exec() returns 1 if the string p1 matches the last compiled
acl/acl.c:	rc = slapi_re_exec( re, realval, -1 /* no timelimit */ );
acl/acl.c:	slapi_re_free(re);
}}}

Created attachment 1112056 [details]
perf top output

Created attachment 1112131 [details]
perf data file

PFA, hence the bug is verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-0737.html