diff --git a/qemu.changes b/qemu.changes
index 28771992..c3ced66d 100644
--- a/qemu.changes
+++ b/qemu.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Mon Dec 13 15:31:38 UTC 2021 - Dirk Müller <dmueller@suse.com>
+
+- disable QOM cast debug outside the testsuite as the corresponding
+  asserts show up occassionally as top #1 in perf(1) traces under
+  heavy virtio load 
+- enable LTO when we'd like to use LTO
+
 -------------------------------------------------------------------
 Tue Dec  7 18:17:14 UTC 2021 - Dario Faggioli <dfaggioli@suse.com>
 
diff --git a/qemu.spec b/qemu.spec
index b7f08ff3..5c888951 100644
--- a/qemu.spec
+++ b/qemu.spec
@@ -1294,6 +1294,12 @@ cd %blddir
 	--disable-stack-protector \
 	--disable-strip \
 	--disable-tcg-interpreter \
+%if "%{_lto_cflags}" != "%{nil}"
+	--enable-lto \
+%endif
+%if "%flavor" != "testsuite"
+	--disable-qom-cast-debug \
+%endif
 	--with-git-submodules=ignore \
 %if "%{name}" != "qemu-linux-user"
 	--with-pkgversion="%(echo '%{distro}' | sed 's/ (.*)//')" \
diff --git a/qemu.spec.in b/qemu.spec.in
index 5627c08c..ed6fc55c 100644
--- a/qemu.spec.in
+++ b/qemu.spec.in
@@ -1125,6 +1125,12 @@ cd %blddir
 	--disable-stack-protector \
 	--disable-strip \
 	--disable-tcg-interpreter \
+%if "%{_lto_cflags}" != "%{nil}"
+	--enable-lto \
+%endif
+%if "%flavor" != "testsuite"
+	--disable-qom-cast-debug \
+%endif
 	--with-git-submodules=ignore \
 %if "%{name}" != "qemu-linux-user"
 	--with-pkgversion="%(echo '%{distro}' | sed 's/ (.*)//')" \