diff --git a/Fonderie/Makefile b/Fonderie/Makefile
index ccf71eb7..89bfeadd 100644
--- a/Fonderie/Makefile
+++ b/Fonderie/Makefile
@@ -1,4 +1,6 @@
-
+#
+#		compilation de la fonderie
+#
 
 COPT = -g -no-pie -Wall -DDEBUG_LEVEL=0 -Werror=parentheses
 LIBS = -lfloatimg -lpnglite -lm 
@@ -11,7 +13,7 @@ fonderie:	fonderie.c ${DEPS} ${OBJS} Makefile
 crapulator.o:	crapulator.c ${DEPS} Makefile
 	gcc ${COPT} -c $<
 
-fonctions.o:	fonctions.c ${DEPS} Makefile
+fonctions.o:	fonctions.c fonctions.h Makefile
 	gcc ${COPT} -c $<
 
 sfx.o:	sfx.c ${DEPS} Makefile
diff --git a/Fonderie/fonctions.c b/Fonderie/fonctions.c
index 5544e2ec..0ee6a19f 100644
--- a/Fonderie/fonctions.c
+++ b/Fonderie/fonctions.c
@@ -23,7 +23,22 @@ extern	int		verbosity;
 static	A_Fifo		g_fifo;
 
 /* -------------------------------------------------------------- */
+static int big_adder(FloatImg *from, FloatImg *to)
+{
+int		size, idx;
 
+size = from->width * from->height;
+
+for (idx=0; idx<size; idx++)		to->R[idx] += from->R[idx];
+for (idx=0; idx<size; idx++)		to->G[idx] += from->G[idx];
+for (idx=0; idx<size; idx++)		to->B[idx] += from->B[idx];
+
+return 0;
+}
+/* -------------------------------------------------------------- */
+/*
+ *	97% of the total run time was in that function \o_
+ */
 int faire_la_somme(A_Fifo *pfifo, FloatImg *destination, int step)
 {
 int		idx, foo;
@@ -36,7 +51,11 @@ else	{
 
 fimg_clear(pdest);
 for (idx=0; idx<pfifo->nbslots; idx += step) {
-	foo = fimg_add_2(&(pfifo->slots[idx]), pdest);
+	/***************************************
+	 *    Here was the giant bootleneck    *
+	 ***************************************/
+	// HERE -> foo = fimg_add_2(&(pfifo->slots[idx]), pdest);
+	foo = big_adder(&(pfifo->slots[idx]), pdest);
 	if (foo)
 		{
 		fprintf(stderr, "%s: err %d on add_2\n", __func__, foo);
diff --git a/Fonderie/fonderie.c b/Fonderie/fonderie.c
index b4a7a227..fb316e08 100644
--- a/Fonderie/fonderie.c
+++ b/Fonderie/fonderie.c
@@ -61,7 +61,7 @@ puts("");
 return 0;
 }
 /* -------------------------------------------------------------- */
-#define BLANK	30
+#define BLANK	50
 
 int demarre_la_machine(char *pattern, char *outdir, int szfifo,
 				int infx, int outfx, int step)