diff --git a/spa/include/spa/support/cpu.h b/spa/include/spa/support/cpu.h
index c69338855..2faf42154 100644
--- a/spa/include/spa/support/cpu.h
+++ b/spa/include/spa/support/cpu.h
@@ -62,6 +62,7 @@ struct spa_cpu { struct spa_interface iface; };
 #define SPA_CPU_FLAG_BMI2		(1<<18)	/**< Bit Manipulation Instruction Set 2 */
 #define SPA_CPU_FLAG_AVX512		(1<<19)	/**< AVX-512 */
 #define SPA_CPU_FLAG_SLOW_UNALIGNED	(1<<20)	/**< unaligned loads/stores are slow */
+#define SPA_CPU_FLAG_SLOW_GATHER	(1<<21)	/**< gather functions are slow */
 
 /* PPC specific */
 #define SPA_CPU_FLAG_ALTIVEC		(1<<0)	/**< standard */
diff --git a/spa/plugins/audioconvert/fmt-ops.c b/spa/plugins/audioconvert/fmt-ops.c
index 3fc2c5f0a..057f3294a 100644
--- a/spa/plugins/audioconvert/fmt-ops.c
+++ b/spa/plugins/audioconvert/fmt-ops.c
@@ -108,6 +108,9 @@ static struct conv_info conv_table[] =
 	MAKE(U32, F32, 0, conv_u32_to_f32_c),
 	MAKE(U32, F32P, 0, conv_u32_to_f32d_c),
 
+#if defined (HAVE_SSE2)
+	MAKE(S32, F32P, 0, conv_s32_to_f32d_sse2, SPA_CPU_FLAG_SSE2 | SPA_CPU_FLAG_SLOW_GATHER),
+#endif
 #if defined (HAVE_AVX2)
 	MAKE(S32, F32P, 0, conv_s32_to_f32d_avx2, SPA_CPU_FLAG_AVX2),
 #endif
@@ -129,6 +132,9 @@ static struct conv_info conv_table[] =
 
 	MAKE(S24, F32, 0, conv_s24_to_f32_c),
 	MAKE(S24P, F32P, 0, conv_s24d_to_f32d_c),
+#if defined (HAVE_SSE2)
+	MAKE(S24, F32P, 0, conv_s24_to_f32d_sse2, SPA_CPU_FLAG_SSE2 | SPA_CPU_FLAG_SLOW_GATHER),
+#endif
 #if defined (HAVE_AVX2)
 	MAKE(S24, F32P, 0, conv_s24_to_f32d_avx2, SPA_CPU_FLAG_AVX2),
 #endif
diff --git a/spa/plugins/support/cpu-x86.c b/spa/plugins/support/cpu-x86.c
index c1c53855d..0fb866671 100644
--- a/spa/plugins/support/cpu-x86.c
+++ b/spa/plugins/support/cpu-x86.c
@@ -78,6 +78,8 @@ x86_init(struct impl *impl)
 		if ((ebx & AVX512_BITS) == AVX512_BITS)
 			flags |= SPA_CPU_FLAG_AVX512;
 	}
+	if (max_level < 0x16)
+		flags |= SPA_CPU_FLAG_SLOW_GATHER;
 
 	/* Check cpuid level of extended features.  */
 	__cpuid (0x80000000, ext_level, ebx, ecx, edx);