diff --git a/CMakeLists.txt b/CMakeLists.txt
index dce6aad..74b20e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,9 +26,10 @@ set(SOURCES
   src/gint/dsp.s
   src/gint/dump.c
   src/gint/gray.c
+  src/gint/image.c
   src/gint/keyboard.c
   src/gint/kmalloc.c
-  src/gint/image.c
+  src/gint/overclock.c
   src/gint/ram.c
   src/gint/rtc.c
   src/gint/spuram.c
diff --git a/include/gintctl/gint.h b/include/gintctl/gint.h
index c87f3a5..9bd00f3 100644
--- a/include/gintctl/gint.h
+++ b/include/gintctl/gint.h
@@ -26,6 +26,9 @@ void gintctl_gint_drivers(void);
 /* gintctl_gint_tlb(): TLB miss handler and TLB management */
 void gintctl_gint_tlb(void);
 
+/* gintctl_gint_overclock(): Clock speed detection and setting */
+void gintctl_gint_overclock(void);
+
 /* gintct_gint_keyboard: Real-time keyboard visualization */
 void gintctl_gint_keyboard(void);
 
diff --git a/src/gint/image.c b/src/gint/image.c
index e3e3b93..a67e7b2 100644
--- a/src/gint/image.c
+++ b/src/gint/image.c
@@ -156,13 +156,7 @@ static void scene_2(void)
 	int cx2=cx1, cy2=cy1;
 	image_rotate_around_scale(train, 1.4, 1.3*65536, true, &cx2, &cy2, &map);
 
-	int new_format =
-		IMAGE_IS_RGB16(train->format) ? IMAGE_RGB565A : IMAGE_P8_RGB565A;
-	image_t *tmp = image_alloc(map.dst_w, map.dst_h, new_format);
-	image_copy_palette(train, tmp, -1);
-	image_clear(tmp);
-
-	image_linear(train, tmp, &map);
+	image_t *tmp = image_linear_alloc(train, &map);
 	image_copy(tmp, image_at(vram, 10, 10), true);
 
 	dprint(4, 116, C_BLACK, "Center: %d %d -> %d %d", cx1, cy1, cx2, cy2);
diff --git a/src/gint/overclock.c b/src/gint/overclock.c
new file mode 100644
index 0000000..ec91cc1
--- /dev/null
+++ b/src/gint/overclock.c
@@ -0,0 +1,116 @@
+#include <gint/display.h>
+#include <gint/keyboard.h>
+#include <gint/clock.h>
+#include <gint/timer.h>
+#include <gint/mpu/cpg.h>
+#include <gint/mpu/bsc.h>
+
+#include <gintctl/gint.h>
+#include <gintctl/util.h>
+
+#include <libprof.h>
+#include <stdio.h>
+
+#ifdef FXCG50
+
+#define CPG SH7305_CPG
+#define BSC SH7305_BSC
+
+char const *level_string(int level)
+{
+	static char str[32];
+
+	if(level == CLOCK_SPEED_UNKNOWN)
+		return "UNKNOWN";
+	if(level == CLOCK_SPEED_F1)
+		return "Ftune's F1";
+	if(level == CLOCK_SPEED_F2)
+		return "Ftune's F2";
+	if(level == CLOCK_SPEED_F3)
+		return "Ftune's F3";
+	if(level == CLOCK_SPEED_F4)
+		return "Ftune's F4";
+	if(level == CLOCK_SPEED_F5)
+		return "Ftune's F5";
+
+	snprintf(str, 32, "<Level %d>", level);
+	return str;
+}
+
+static int callback(volatile int *counter, volatile int *update)
+{
+	(*counter)++;
+	*update = 1;
+	return TIMER_CONTINUE;
+}
+
+void gintctl_gint_overclock(void)
+{
+	int key = 0;
+	volatile int counter = 0;
+	volatile int update = 0;
+
+	int t = timer_configure(TIMER_TMU, 100000,
+		GINT_CALL(callback, &counter, &update));
+	if(t >= 0)
+		timer_start(t);
+
+	while(key != KEY_EXIT) {
+		int level = clock_get_speed();
+
+		uint32_t time_dclear = prof_exec({
+			dclear(C_WHITE);
+		});
+		row_title("Clock speed detection and setting");
+
+		row_print( 1, 29, "FLLFRQ:");
+		row_print( 2, 29, "FRQCR:");
+		row_print( 3, 29, "CS0BCR:");
+		row_print( 4, 29, "CS2BCR:");
+		row_print( 5, 29, "CS3BCR:");
+		row_print( 6, 29, "CS5aBCR:");
+		row_print( 7, 29, "CS0WCR:");
+		row_print( 8, 29, "CS2WCR:");
+		row_print( 9, 29, "CS3WCR:");
+		row_print(10, 29, "CS5aWCR:");
+
+		row_print( 1, 38, "0x%08x", CPG.FLLFRQ.lword);
+		row_print( 2, 38, "0x%08x", CPG.FRQCR.lword);
+		row_print( 3, 38, "0x%08x", BSC.CS0BCR.lword);
+		row_print( 4, 38, "0x%08x", BSC.CS2BCR.lword);
+		row_print( 5, 38, "0x%08x", BSC.CS3BCR.lword);
+		row_print( 6, 38, "0x%08x", BSC.CS5ABCR.lword);
+		row_print( 7, 38, "0x%08x", BSC.CS0WCR.lword);
+		row_print( 8, 38, "0x%08x", BSC.CS2WCR.lword);
+		row_print( 9, 38, "0x%08x", BSC.CS3WCR.lword);
+		row_print(10, 38, "0x%08x", BSC.CS5AWCR.lword);
+
+		row_print(1, 1, "Detected level: %s", level_string(level));
+		row_print(2, 1, "dclear(): %d us", time_dclear);
+		if(t >= 0)
+			row_print(3, 1, "Timer: %.1D s", counter);
+		else
+			row_print(3, 1, "Timer: none available");
+
+		fkey_button(1, "Set: F1");
+		fkey_button(2, "Set: F2");
+		fkey_button(3, "Set: F3");
+		fkey_button(4, "Set: F4");
+		fkey_button(5, "Set: F5");
+		dupdate();
+
+		key = getkey_opt(GETKEY_DEFAULT, &update).key;
+		update = 0;
+
+		if(key == KEY_F1) clock_set_speed(CLOCK_SPEED_F1);
+		if(key == KEY_F2) clock_set_speed(CLOCK_SPEED_F2);
+		if(key == KEY_F3) clock_set_speed(CLOCK_SPEED_F3);
+		if(key == KEY_F4) clock_set_speed(CLOCK_SPEED_F4);
+		if(key == KEY_F5) clock_set_speed(CLOCK_SPEED_F5);
+	}
+
+	if(t >= 0)
+		timer_stop(t);
+}
+
+#endif
diff --git a/src/gintctl.c b/src/gintctl.c
index 66d4717..a44771c 100644
--- a/src/gintctl.c
+++ b/src/gintctl.c
@@ -43,6 +43,9 @@ struct menu menu_gint = {
 	{ "Memory dump",        gintctl_gint_dump, 0 },
 	{ "Drivers and worlds", gintctl_gint_drivers, 0 },
 	{ "TLB management",     gintctl_gint_tlb, 0 },
+	#ifdef FXCG50
+	{ "Overclocking",       gintctl_gint_overclock, MENU_SH4_ONLY },
+	#endif
 	{ "Memory allocation",  gintctl_gint_kmalloc, 0 },
 	{ "Keyboard",           gintctl_gint_keyboard, 0 },
 	{ "Timers",             gintctl_gint_timer, 0 },