diff --git a/rtdata/languages/default b/rtdata/languages/default
index 438f2005d..1762c83de 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2100,6 +2100,8 @@ TP_LOCALLAB_RESID;Residual Image
 TP_LOCALLAB_CONTRESID;Contrast
 TP_LOCALLAB_RETI;Retinex - Strong local contrast
 TP_LOCALLAB_RETI_NEIGH_VART_TOOLTIP;Adapt these values according to images - if misty images and depending on whether you want to act on the front or the background
+TP_LOCALLAB_LC_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nDimensions can be reduced by a few pixels to optimize FFTW.
+TP_LOCALLAB_RETI_FFTW_TOOLTIP;FFT improve quality and allow big radius.\nThe treatment time depends on the surface to be treated.\nDimensions can be reduced by a few pixels to optimize FFTW.\nThis optimization is not possible if the 2 delimiters of the Spot (vertical or horizontal) are outside the image
 TP_LOCALLAB_TRANSMISSIONGAIN;Transmission gain
 TP_LOCALLAB_STREN;Compression Strength
 TP_LOCALLAB_STRGRID;Strength
diff --git a/rtengine/curves.cc b/rtengine/curves.cc
index 9ce37dd92..62fa4bc23 100644
--- a/rtengine/curves.cc
+++ b/rtengine/curves.cc
@@ -1125,7 +1125,7 @@ void CurveFactory::complexCurvelocal(double ecomp, double black, double hlcompr,
 
         int k = avg * 32768;
         avg = lightCurveloc[k];
-        printf("avg=%f lumaref=%f\n", avg, lumare/100.f);
+     //   printf("avg=%f lumaref=%f\n", avg, lumare/100.f);
         std::vector<double> contrastcurvePoints;
         bool lumm = true;
 
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index a7ca9c6ae..daba5a1e4 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -152,7 +152,7 @@ Locallab::Locallab():
     // Retinex
     str(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STR"), 0., 100., 0.1, 0.0))),
     chrrt(Gtk::manage(new Adjuster(M("TP_LOCALLAB_CHRRT"), 0.0, 100.0, 0.1, 0.0))),
-    neigh(Gtk::manage(new Adjuster(M("TP_LOCALLAB_NEIGH"), 4., 500., 0.5, 50.))),
+    neigh(Gtk::manage(new Adjuster(M("TP_LOCALLAB_NEIGH"), 4., 1000., 0.5, 50.))),
     vart(Gtk::manage(new Adjuster(M("TP_LOCALLAB_VART"), 4.0, 500., 0.1, 70.))),
     dehaz(Gtk::manage(new Adjuster(M("TP_LOCALLAB_DEHAZ"), 0, 100, 1, 0))),
     sensih(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SENSIH"), 0, 100, 1, 30))),
@@ -850,6 +850,7 @@ Locallab::Locallab():
     expreti->signal_button_release_event().connect_notify(sigc::bind(sigc::mem_fun(this, &Locallab::foldAllButMe), expreti));
     enableretiConn = expreti->signal_enabled_toggled().connect(sigc::bind(sigc::mem_fun(this, &Locallab::enableToggled), expreti));
     fftwretiConn  = fftwreti->signal_toggled().connect(sigc::mem_fun(*this, &Locallab::fftwretiChanged));
+    if(showtooltip) fftwreti->set_tooltip_text(M("TP_LOCALLAB_RETI_FFTW_TOOLTIP"));
 
     setExpandAlignProperties (expmaskreti, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_START);
     expmaskreti->signal_button_release_event().connect_notify(sigc::bind(sigc::mem_fun(this, &Locallab::foldAllButMe), expmaskreti));
@@ -1022,6 +1023,7 @@ Locallab::Locallab():
     expcontrast->signal_button_release_event().connect_notify(sigc::bind(sigc::mem_fun(this, &Locallab::foldAllButMe), expcontrast));
     enablecontrastConn = expcontrast->signal_enabled_toggled().connect(sigc::bind(sigc::mem_fun(this, &Locallab::enableToggled), expcontrast));
     fftwlcConn  = fftwlc->signal_toggled().connect(sigc::mem_fun(*this, &Locallab::fftwlcChanged));
+    if(showtooltip) fftwlc->set_tooltip_text(M("TP_LOCALLAB_LC_FFTW_TOOLTIP"));
 
     lcradius->setAdjusterListener(this);