diff --git a/rtdata/languages/default b/rtdata/languages/default
index a2d1edc6b..7540be8f5 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2071,7 +2071,7 @@ TP_LOCALLAB_BALAN;Balance deltaE ab-L
 TP_LOCALLAB_BILATERAL;Bilateral filter
 TP_LOCALLAB_BLENDMASKCOL;Blend
 TP_LOCALLAB_BLUR;Gaussian Blur and Noise
-TP_LOCALLAB_BLUMETHOD_TOOLTIP;To blur the background and isolate the foreground:\nBlur the background by a RT-spot fully covering the image (scope #100).\nIsolate the foreground by an excluding RT-spot with the tools you want, you can use a mask to enhance and amplify the effects 
+TP_LOCALLAB_BLUMETHOD_TOOLTIP;To blur the background and isolate the foreground:\n*Blur the background by a RT-spot fully covering the image (high values for scope and transition) - normal or inverse.\n*Isolate the foreground by one or more excluding RT-spot with the tools you want (increse scope), you can use a mask to enhance and amplify the effects 
 TP_LOCALLAB_BLMED;Median
 TP_LOCALLAB_BLGUID;Guided Filter Luminance
 TP_LOCALLAB_GUIDBL;Soft radius
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 96a5f2add..29bd894b0 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -6929,7 +6929,7 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
 
         }
 
-        if (((radius >= 1.5 * GAUSS_SKIP && lp.rad > 1.) || lp.stren > 0.1 || lp.blmet == 1 || lp.guidb > 1 || lp.showmaskblmet == 2 || lp.enablMask || lp.showmaskblmet == 3 || lp.showmaskblmet == 4) && lp.blurena) { // radius < GAUSS_SKIP means no gauss, just copy of original image
+        if (((radius >= 5. * GAUSS_SKIP && lp.rad > 1.) || lp.stren > 0.1 || lp.blmet == 1 || lp.guidb > 1 || lp.showmaskblmet == 2 || lp.enablMask || lp.showmaskblmet == 3 || lp.showmaskblmet == 4) && lp.blurena) { // radius < GAUSS_SKIP means no gauss, just copy of original image
             std::unique_ptr<LabImage> tmp1;
             std::unique_ptr<LabImage> tmp2;
             const int ystart = std::max(static_cast<int>(lp.yc - lp.lyT) - cy, 0);
@@ -6984,26 +6984,38 @@ void ImProcFunctions::Lab_Local(int call, int sp, float** shbuffer, LabImage * o
                     }
 
 
-                    if (lp.blurmet == 0  && lp.blmet == 0) {
+                    if (lp.blurmet == 0  && lp.blmet == 0  && radius >= (5. * GAUSS_SKIP)) {
 #ifdef _OPENMP
                         #pragma omp parallel
 #endif
 
                         {
-                            gaussianBlur(tmp1->L, tmp1->L, bfw, bfh, radius);
-                            gaussianBlur(tmp1->a, tmp1->a, bfw, bfh, radius);
-                            gaussianBlur(tmp1->b, tmp1->b, bfw, bfh, radius);
+                            if(radius > 200.f) {//to test not optimize
+                                ImProcFunctions::fftw_convol_blur2(tmp1->L, tmp1->L, bfw, bfh, radius, 0, 0);
+                                ImProcFunctions::fftw_convol_blur2(tmp1->a, tmp1->a, bfw, bfh, radius, 0, 0);
+                                ImProcFunctions::fftw_convol_blur2(tmp1->b, tmp1->b, bfw, bfh, radius, 0, 0);
+                            } else {
+                                gaussianBlur(tmp1->L, tmp1->L, bfw, bfh, radius);
+                                gaussianBlur(tmp1->a, tmp1->a, bfw, bfh, radius);
+                                gaussianBlur(tmp1->b, tmp1->b, bfw, bfh, radius);
+                            }
                         }
 
-                    } else if (lp.blurmet == 1  && lp.blmet == 0) {
+                    } else if (lp.blurmet == 1  && lp.blmet == 0 && radius >= (5. * GAUSS_SKIP)) {
 
 #ifdef _OPENMP
                         #pragma omp parallel
 #endif
                         {
-                            gaussianBlur(original->L, tmp1->L, GW, GH, radius);
-                            gaussianBlur(original->a, tmp1->a, GW, GH, radius);
-                            gaussianBlur(original->b, tmp1->b, GW, GH, radius);
+                            if(radius > 200.f) {//to test not optimize
+                                ImProcFunctions::fftw_convol_blur2(tmp1->L, tmp1->L, GW, GH, radius, 0, 0);
+                                ImProcFunctions::fftw_convol_blur2(tmp1->a, tmp1->a, GW, GH, radius, 0, 0);
+                                ImProcFunctions::fftw_convol_blur2(tmp1->b, tmp1->b, GW, GH, radius, 0, 0);
+                            } else {
+                                gaussianBlur(original->L, tmp1->L, GW, GH, radius);
+                                gaussianBlur(original->a, tmp1->a, GW, GH, radius);
+                                gaussianBlur(original->b, tmp1->b, GW, GH, radius);
+                            }
                         }
                     }
 
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 986103f64..214b1535e 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -2537,7 +2537,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     softMethod("soft"),
     // Blur & Noise
     expblur(false),
-    radius(1.0),
+    radius(5.0),
     strength(0),
     sensibn(40),
     itera(1),
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 50412f508..24e56624a 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -240,7 +240,7 @@ Locallab::Locallab():
     laplace(Gtk::manage(new Adjuster(M("TP_LOCALLAB_LAPLACE"), 0., 100., 0.5, 25.))),
     sensisf(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSI"), 1, 100, 1, 15))),
     // Blur & Noise
-    radius(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RADIUS"), 1.0, 300.0, 0.1, 1.0))),
+    radius(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RADIUS"), 5.0, 1000.0, 0.1, 5.0))),
     strength(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STRENGTH"), 0, 100, 1, 0))),
     itera(Gtk::manage(new Adjuster(M("TP_DIRPYRDENOISE_MEDIAN_PASSES"), 1, 4, 1, 1))),
     guidbl(Gtk::manage(new Adjuster(M("TP_LOCALLAB_GUIDBL"), 1, 300, 1, 1))),