diff --git a/lib_com/options.h b/lib_com/options.h
index cb8918eed76624e373c2b065ad24bf551b2aa32e..3e62b995b6905793f2323d7d44cc96b3690badfe 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -97,4 +97,5 @@
 #define FIX_1104_OPT_GETMINSCALEFAC             /* FhG: Optimize get_min_scalefactor(), avoid IF */
 #define FIX_1106_SIMPLIFY_SET32FX               /* FhG: simplify set32_fx() */
 #define FIX_1107_VADDINC                        /* FhG: Optimize v_add_inc_fx() for most frequent case */
+#define FIX_1009_OPT_PARAMMC_RENDER             /* FhG: Optimize ivas_param_mc_dec_render_fx() */
 #endif
diff --git a/lib_dec/ivas_mc_param_dec.c b/lib_dec/ivas_mc_param_dec.c
index fc158ca89d75cd413ffdeb4b76b0b6efe2f31fa2..e3d8bf0c034ff19afd08dd299334be9c128ad9f5 100644
--- a/lib_dec/ivas_mc_param_dec.c
+++ b/lib_dec/ivas_mc_param_dec.c
@@ -1968,10 +1968,13 @@ void ivas_param_mc_dec_render_fx(
     slot_idx_start_cldfb_synth = 0;
     move16();
 
+#ifndef FIX_1009_OPT_PARAMMC_RENDER
     Flag is_zero = 1;
     move32();
+#endif
     FOR( j = 0; j < st_ivas->hParamMC->hMetadataPMC->nbands_coded; j++ )
     {
+#ifndef FIX_1009_OPT_PARAMMC_RENDER
         is_zero = 1;
         move16();
         FOR( i = 0; i < hParamMC->h_output_synthesis_cov_state.mixing_matrix_len; i++ )
@@ -1989,8 +1992,19 @@ void ivas_param_mc_dec_render_fx(
         }
         is_zero = 1;
         move16();
+#else
+        Flag is_zero = is_zero_arr( hParamMC->h_output_synthesis_cov_state.mixing_matrix_fx[j], hParamMC->h_output_synthesis_cov_state.mixing_matrix_len );
+        {
+            if ( is_zero != 0 )
+            {
+                hParamMC->h_output_synthesis_cov_state.mixing_matrix_exp[j] = 0;
+                move16();
+            }
+        }
+#endif
         IF( LT_16( st_ivas->hParamMC->band_grouping[j], st_ivas->hParamMC->h_output_synthesis_params.max_band_decorr ) )
         {
+#ifndef FIX_1009_OPT_PARAMMC_RENDER
             FOR( i = 0; i < hParamMC->h_output_synthesis_cov_state.mixing_matrix_res_len; i++ )
             {
                 IF( NE_32( hParamMC->h_output_synthesis_cov_state.mixing_matrix_res_fx[j][i], 0 ) )
@@ -2000,6 +2014,10 @@ void ivas_param_mc_dec_render_fx(
                 }
             }
             IF( is_zero )
+#else
+            is_zero = is_zero_arr( hParamMC->h_output_synthesis_cov_state.mixing_matrix_res_fx[j], hParamMC->h_output_synthesis_cov_state.mixing_matrix_res_len );
+            if ( is_zero != 0 )
+#endif
             {
                 hParamMC->h_output_synthesis_cov_state.mixing_matrix_res_exp[j] = 0;
                 move16();