diff --git a/lib_com/options.h b/lib_com/options.h
index c228d4cc6d6fe121615ccd7bedac1e62d7fef302..daa609ed4784d0aec8826dadec02ddef1bf6fcd9 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -69,8 +69,8 @@
 
 #define FIX_867_CLDFB_NRG_SCALE
 
-#define FIX_1378_ACELP_OUT_OF_BOUNDS
-
+#define FIX_1378_ACELP_OUT_OF_BOUNDS
+
 #define FIX_1379_MASA_ANGLE_ROUND
 
 /* Note: each compile switch (FIX_1101_...) is independent from the other ones */
@@ -86,10 +86,15 @@
 //#define HARM_SCE_INIT
 #define DIV32_OPT_NEWTON                               /* FhG: faster 32 by 32 bit division */ 
 #define	MERGE_REQUEST_1378_SPEEDUP_ivas_mc_param_enc_fx_NONBE /* FhG: reduce WMOPS of Cy calculation in ivas_param_mc_param_est_enc_fx() by using 64 Bit addition. Obsoletes IMPROVE_HIGH_COMPLEXITY_PARAM_MC_PRM_EST_NONBE. */
+#define FIX_1439_SPEEDUP_Copy_Scale_sig_16_32_no_sat            /*FhG: reduces WMOPS - bit-exact*/
+#define FIX_1439_SPEEDUP_stereo_icBWE_dec_fx                    /*FhG: reduces WMOPS - bit-exact*/
+#define FIX_1439_SPEEDUP_ivas_swb_tbe_dec_fx                    /*FhG: reduces WMOPS - bit-exact*/
+#define FIX_1439_SPEEDUP_synthesise_fb_high_band_fx             /*FhG: reduces WMOPS - bit-exact*/
 #define FIX_1481_HARDCODE_DIV                          /* FhG: hardcode division results in stereo_dmx_evs_init_encoder_fx() */
 
 #define TEST_HR
 
 
 #define REMOVE_EVS_DUPLICATES                   /* remove core-coder duplicated functions, ACELP low-band decoder */
+
 #endif
diff --git a/lib_com/swb_tbe_com_fx.c b/lib_com/swb_tbe_com_fx.c
index 869d73733629d32357fc04346799cfaf2a981112..2c0da33f5071c614d2b739b7d87e6d6d6ef0b774 100644
--- a/lib_com/swb_tbe_com_fx.c
+++ b/lib_com/swb_tbe_com_fx.c
@@ -6714,7 +6714,6 @@ void elliptic_bpf_48k_generic_fx(
         memory_fx[0][i] = shl_sat( memory_fx0[0][i], sub( *Q_input_fx, memory_fx_Q[0] ) );
         memory2_fx[1][i] = L_shl_sat( memory_fx2[1][i], sub( add( *Q_input_fx, 11 ), memory_fx_Q[1] ) );
         memory2_fx[2][i] = L_shl_sat( memory_fx2[2][i], sub( add( *Q_input_fx, 6 ), memory_fx_Q[2] ) );
-        memory2_fx[3][i] = L_shl_sat( memory_fx2[3][i], sub( add( *Q_input_fx, 1 ), memory_fx_Q[3] ) );
         move32();
         move32();
         move32();
@@ -7074,6 +7073,50 @@ void synthesise_fb_high_band_fx(
     tmp3 = add( sub( Qout, add( sub( 1, exp ), exp_tmp ) ), 16 ); /*Qout - (1 -exp +exp_tmp) + 16 */
     FOR( i = 0; i < L_FRAME48k; i++ )
     {
+#ifdef FIX_1439_SPEEDUP_synthesise_fb_high_band_fx
+        L_tmp = Mult_32_16( ratio2, tmp[i] ); /* Q(16-exp+exp_tmp-15 = 1-exp+exp_tmp) */
+        Word32 L_tmp32;
+        Word16 tmp16;
+
+        // if (L_tmp < 0)
+        if ( L_tmp < 0 )
+        {
+            L_tmp32 = L_negate( L_tmp );
+        }
+        if ( L_tmp < 0 )
+        {
+            L_tmp32 = L_shl_sat( L_tmp32, tmp3 );
+        }
+        if ( L_tmp < 0 )
+        {
+            tmp16 = extract_h( L_tmp32 );
+        }
+        if ( L_tmp < 0 )
+        {
+            tmp16 = negate( tmp16 );
+        }
+
+        // if (L_tmp == 0)
+        if ( L_tmp == 0 )
+        {
+            tmp16 = 0;
+            move16();
+        }
+
+        // if (L_tmp > 0)
+        if ( L_tmp > 0 )
+        {
+            L_tmp32 = L_shl_sat( L_tmp, tmp3 );
+        }
+        if ( L_tmp > 0 )
+        {
+            tmp16 = extract_h( L_tmp32 );
+        }
+
+        output[i] = tmp16;
+        move16();
+
+#else
         L_tmp = Mult_32_16( ratio2, tmp[i] ); /* Q(16-exp+exp_tmp-15 = 1-exp+exp_tmp) */
         IF( L_tmp < 0 )
         {
@@ -7085,6 +7128,7 @@ void synthesise_fb_high_band_fx(
             output[i] = extract_h( L_shl_sat( L_tmp, tmp3 ) ); /*Qout*/
             move16();
         }
+#endif
     }
     return;
 }
diff --git a/lib_com/tools_fx.c b/lib_com/tools_fx.c
index 5f0e172bf5059905e04bbb9a205c91e4d22fdf5f..6dc1c45f29bea357c3529bd90ec7b2cace0924be 100644
--- a/lib_com/tools_fx.c
+++ b/lib_com/tools_fx.c
@@ -794,13 +794,37 @@ void Copy_Scale_sig_16_32_no_sat(
         }
         return;
     }
+#ifdef FIX_1439_SPEEDUP_Copy_Scale_sig_16_32_no_sat
+    L_tmp = L_shl_o( 1, exp0 - 1, &Overflow );
+
+    IF( L_tmp >= 0x7FFF )
+    {
+        FOR( i = 0; i < lg; i++ )
+        {
+            // y[i] = L_mult0(x[i], L_tmp);
+            y[i] = W_extract_l( W_mult_32_16( L_tmp, x[i] ) );
+            move32(); /* Overflow can occur here */
+        }
+        return;
+    }
+    // ELSE
+    {
+        Word16 tmp = extract_l( L_tmp );
+        FOR( i = 0; i < lg; i++ )
+        {
+            y[i] = L_mult( x[i], tmp );
+            move32();
+        }
+    }
+#else
     L_tmp = L_shl_o( 1, exp0 - 1, &Overflow );
     FOR( i = 0; i < lg; i++ )
     {
         // y[i] = L_mult0(x[i], L_tmp);
         y[i] = W_extract_l( W_mult_32_16( L_tmp, x[i] ) );
-        move32(); /* saturation can occur here */
+        move32(); /* Overflow can occur here */
     }
+#endif
 }
 
 void Copy_Scale_sig_32_16(
diff --git a/lib_dec/ivas_stereo_icbwe_dec_fx.c b/lib_dec/ivas_stereo_icbwe_dec_fx.c
index c7bc98566326d456bc85283242ad1137e28fb4c6..772eb2d7d218c7061e3fd9208ac65f818c0ad218 100644
--- a/lib_dec/ivas_stereo_icbwe_dec_fx.c
+++ b/lib_dec/ivas_stereo_icbwe_dec_fx.c
@@ -904,6 +904,9 @@ void stereo_icBWE_dec_fx(
     winSlope_fx = div_s( 1, winLen_fx );                       /* Q15 */
     alpha_fx = winSlope_fx;                                    /* Q15 */
     move16();
+#ifdef FIX_1439_SPEEDUP_stereo_icBWE_dec_fx
+    Word16 winSlope_fx_ = sub( 32767 /* 1.0 in Q15*/, winSlope_fx );
+#endif
     FOR( i = 0; i < winLen_fx; i++ )
     {
         L_tmp = L_mult0( alpha_fx, icbweM2Ref_fx );                                                        /* Q29 */
@@ -911,10 +914,17 @@ void stereo_icBWE_dec_fx(
         tmp = shl( round_fx( L_tmp ), 1 );                                                                 /* Q14 */
         synthRef_fx[i] = Mpy_32_16_1( synthRef_fx[i], tmp );                                               /* Qsyn - 1 */
         move32();
+#ifdef FIX_1439_SPEEDUP_stereo_icBWE_dec_fx
+        if ( LE_16( alpha_fx, winSlope_fx_ ) )
+        {
+            alpha_fx = add( alpha_fx, winSlope_fx ); /* Q15 */
+        }
+#else
         IF( LE_16( alpha_fx, sub( 32767 /* 1.0 in Q15*/, winSlope_fx ) ) )
         {
             alpha_fx = add( alpha_fx, winSlope_fx ); /* Q15 */
         }
+#endif
     }
 
     FOR( ; i < NS2SA_FX2( st->output_Fs, FRAME_SIZE_NS ); i++ )
diff --git a/lib_dec/swb_tbe_dec_fx.c b/lib_dec/swb_tbe_dec_fx.c
index 1b51a29fb642cfffd08c7a39517f1f2d7224b226..00be6455dc513fb50178f811b26fd32e5ba3e57b 100644
--- a/lib_dec/swb_tbe_dec_fx.c
+++ b/lib_dec/swb_tbe_dec_fx.c
@@ -7022,14 +7022,24 @@ void ivas_swb_tbe_dec_fx(
 
             tmp1 = 0;
             move16();
+
+#ifdef FIX_1439_SPEEDUP_ivas_swb_tbe_dec_fx
+            Word32 idx32 = L_shr_r( 0x00333333, 10 ); /*NUM_SHB_SUBFR/L_FRAME16k*/ // Q16
+#endif
+
             FOR( i = 0; i < L_FRAME16k; i++ )
             {
+#ifndef FIX_1439_SPEEDUP_ivas_swb_tbe_dec_fx
                 Word16 idx = 0;
                 move16();
                 IF( i != 0 )
                 {
                     idx = idiv1616( i_mult( NUM_SHB_SUBFR, i ), L_FRAME16k );
                 }
+#else
+                Word16 idx;
+                idx = extract_h( imult3216( idx32, i ) ); /*Q0*/
+#endif
                 L_tmp1 = Mult_32_16( L_tmp, GainShape_fx[idx] );                           /* Q : 18 + tmp +15 -15*/
                 White_exc16k_fx[i] = round_fx( Mult_32_16( L_tmp1, White_exc16k_fx[i] ) ); /* 18 + tmp +*Q_white_exc -15 -16 */
                 move16();