diff --git a/leenkx/Sources/iron/object/ParticleSystemCPU.hx b/leenkx/Sources/iron/object/ParticleSystemCPU.hx
index 62160b7b..3e0467e5 100644
--- a/leenkx/Sources/iron/object/ParticleSystemCPU.hx
+++ b/leenkx/Sources/iron/object/ParticleSystemCPU.hx
@@ -394,7 +394,7 @@ class ParticleSystemCPU {
 			if (physics.hasScaleRamp && physics.rampPositions.length > 1) {
 				var normalizedAge: FastFloat = physics.age / physics.lifetime;
 				var scaleMultiplier: FastFloat = interpolateRampValue(normalizedAge, physics.rampPositions, physics.rampColors);
-				var finalScale: FastFloat = scale * (particleScale * (1 - physics.scaleRampSizeFactor) + scaleMultiplier * physics.scaleRampSizeFactor);
+				var finalScale: FastFloat = 1 + (scaleMultiplier - 1) * physics.scaleRampSizeFactor;
 				particle.transform.scale.setFrom(physics.baseScale.clone().mult(finalScale));
 			}
 
diff --git a/leenkx/blender/lnx/material/make_shader.py b/leenkx/blender/lnx/material/make_shader.py
index 27f482bf..6b13a0b8 100644
--- a/leenkx/blender/lnx/material/make_shader.py
+++ b/leenkx/blender/lnx/material/make_shader.py
@@ -210,7 +210,7 @@ def make_instancing_and_skinning(mat: Material, mat_users: Dict[Material, List[O
 
             # Instancing
             inst = bo.lnx_instanced
-            if inst != 'Off' or mat.lnx_particle_flag:
+            if inst != 'Off' or (mat.lnx_particle_flag and lnx.utils.get_rp().lnx_particles == 'GPU'):
                 instancing_usage[0] = True
                 mat_state.uses_instancing = True