diff --git a/backport-optimize-signature-header-merge-a-bit.patch b/backport-optimize-signature-header-merge-a-bit.patch
new file mode 100644
index 0000000..b76bf5a
--- /dev/null
+++ b/backport-optimize-signature-header-merge-a-bit.patch
@@ -0,0 +1,42 @@
+From a427c3cd2776bc523bd40491a5d92d98d071ffea Mon Sep 17 00:00:00 2001
+From: Demi Marie Obenour <athena@invisiblethingslab.com>
+Date: Tue, 16 Mar 2021 11:41:16 +0200
+Subject: [PATCH] Optimize signature header merge a bit
+
+Look up possible offending tags from the main header first in a separate
+loop, this avoids having to re-sort after each headerPut() operation
+---
+ lib/package.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/lib/package.c b/lib/package.c
+index 6f10bb9..355c3e7 100644
+--- a/lib/package.c
++++ b/lib/package.c
+@@ -64,10 +64,14 @@ rpmTagVal headerMergeLegacySigs(Header h, Header sigh, char **msg)
+ {
+     const struct taglate_s *xl;	
+     struct rpmtd_s td;
+-    rpmtdReset(&td);
+     for (xl = xlateTags; xl->stag; xl++) {
+ 	/* There mustn't be one in the main header */
+ 	if (headerIsEntry(h, xl->xtag))
++		goto exit;
++    }
++
++    rpmtdReset(&td);
++    for (xl = xlateTags; xl->stag; xl++) {
+ 		if (headerGet(sigh, xl->stag, &td, HEADERGET_RAW|HEADERGET_MINMEM)) {
+ 	    /* Translate legacy tags */
+ 	    if (xl->stag != xl->xtag)
+@@ -86,6 +90,7 @@ rpmTagVal headerMergeLegacySigs(Header h, Header sigh, char **msg)
+     }
+     rpmtdFreeData(&td);
+ 
++exit:
+     if (xl->stag) {
+ 	rasprintf(msg, "invalid signature tag %s (%d)",
+ 			rpmTagGetName(xl->xtag), xl->xtag);
+-- 
+2.27.0
+
diff --git a/rpm.spec b/rpm.spec
index 0d28563..0370612 100644
--- a/rpm.spec
+++ b/rpm.spec
@@ -1,6 +1,6 @@
 Name:          rpm
 Version:       4.15.1
-Release:       22
+Release:       23
 Summary:       RPM Package Manager
 License:       GPLv2+
 URL:           http://www.rpm.org/
@@ -49,6 +49,7 @@ Patch38: backport-Make-fdSeek-return-0-on-success-1-on-error.patch
 Patch39: backport-Fix-logic-error-in-grabArgs.patch
 Patch40: backport-Use-libelf-for-determining-file-colors.patch
 Patch41: backport-CVE-2021-20271.patch
+Patch42: backport-optimize-signature-header-merge-a-bit.patch
 
 BuildRequires: gcc autoconf automake libtool make gawk popt-devel openssl-devel readline-devel libdb-devel 
 BuildRequires: zlib-devel libzstd-devel xz-devel bzip2-devel libarchive-devel ima-evm-utils-devel
@@ -297,6 +298,12 @@ make check || (cat tests/rpmtests.log; exit 0)
 %{_mandir}/man1/gendiff.1*
 
 %changelog
+* Sat May 22 2021 liudabo<liudabo1@huawei.com> - 4.15.1-22
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:Optimize signature header merge a bit
+
 * Tue Apr 13 2021 liudabo<liudabo1@huawei.com> - 4.15.1-22
 - Type:enhancement
 - ID:NA