diff --git a/src/w32fns.c b/src/w32fns.c
index 1d5a591466c..b2572463e04 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -20,6 +20,7 @@ Copyright (C) 1989, 1992-2024 Free Software Foundation, Inc.
 /* Added by Kevin Gallo */
 
 #include <config.h>
+#include <time.h>
 /* Override API version to get the latest functionality.  */
 #undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0600
@@ -2556,6 +2557,8 @@ funhook (int code, WPARAM w, LPARAM l)
   int console = 0;
   KBDLLHOOKSTRUCT const *hs = (KBDLLHOOKSTRUCT*)l;
 
+  struct timespec begin;
+  clock_gettime (CLOCK_MONOTONIC, &begin);
   if (code < 0 || (hs->flags & LLKHF_INJECTED))
     return CallNextHookEx (0, code, w, l);
 
@@ -2595,6 +2598,11 @@ funhook (int code, WPARAM w, LPARAM l)
 	      kbdhook.winseen = 1;
 	      kbdhook.winsdown++;
 	    }
+	  struct timespec end;
+	  clock_gettime (CLOCK_MONOTONIC, &end);
+	  fprintf (stderr, "KEYDOWN 0x%lx, 0x%lx: %.3g ms\n\n", hs->vkCode, hs->scanCode,
+		   (double)(end.tv_nsec - begin.tv_nsec)/1000000);
+
 	  /* Returning 1 here drops the keypress without further processing.
 	     If the keypress was allowed to go through, the normal Windows
 	     hotkeys would take over.  */
@@ -2602,6 +2610,8 @@ funhook (int code, WPARAM w, LPARAM l)
 	}
       else if (kbdhook.winsdown > 0 && (w == WM_KEYUP || w == WM_SYSKEYUP))
 	{
+	  fprintf (stderr, "KEYUP received, winsdown: %d, w: 0x%llx\n", kbdhook.winsdown, w);
+
 	  /* A key that has been captured earlier is being released now.  */
 	  if (hs->vkCode == VK_LWIN && kbdhook.lwindown)
 	    {
@@ -2640,29 +2650,43 @@ funhook (int code, WPARAM w, LPARAM l)
 			= KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP;
 		      inputs[1].ki.time = 0;
 		      SendInput (2, inputs, sizeof (INPUT));
+		      fprintf (stderr, "Simulated KEYUP to system\n");
 		    }
 		  else if (focus != NULL)
 		    {
 		      /* When not passed to system, must simulate privately to Emacs.	 */
 		      PostMessage (focus, WM_SYSKEYDOWN, hs->vkCode, 0);
 		      PostMessage (focus, WM_SYSKEYUP, hs->vkCode, 0);
+		      fprintf (stderr, "passing to system, simulating privately\n");
 		    }
+		  else
+		    fprintf (stderr, "winsdown == 0, but nothing to do\n");
 		}
 	    }
 	  if (kbdhook.winsdown == 0)
 	    {
+	      fprintf (stderr, "no key pressed anymore, clear flags\n");
 	      /* No Windows keys pressed anymore - clear the state flags.  */
 	      kbdhook.suppress_lone = 0;
 	      kbdhook.winseen = 0;
 	    }
 	  if (!kbdhook.send_win_up)
 	    {
+	      struct timespec end;
+	      clock_gettime (CLOCK_MONOTONIC, &end);
+	      fprintf (stderr, "swallowing KEYUP: %.3g ms\n\n",
+		       (double)(end.tv_nsec - begin.tv_nsec)/1000000);
+
 	      /* Swallow this release message, as not to confuse
 		 applications who did not get to see the original
 		 WM_KEYDOWN message either.  */
 	      return 1;
 	    }
 	  kbdhook.send_win_up = 0;
+	  struct timespec end;
+	  clock_gettime (CLOCK_MONOTONIC, &end);
+	  fprintf (stderr, "KEYUP processed normally: %.3g ms\n\n",
+		   (double)(end.tv_nsec - begin.tv_nsec)/1000000);
 	}
     }
   else if (kbdhook.winsdown > 0)
@@ -2698,10 +2722,19 @@ funhook (int code, WPARAM w, LPARAM l)
 	     channel when the keys are released.  */
 	  kbdhook.suppress_lone = 1;
 	  kbdhook.send_win_up = 1;
+	  struct timespec end;
+	  clock_gettime (CLOCK_MONOTONIC, &end);
+	  fprintf (stderr, "Simulated S-x combination: %.3g ms\n\n",
+		   (double)(end.tv_nsec - begin.tv_nsec)/1000000);
 	  /* Swallow the original keypress (as we want the Win key
 	     down message simulated above to precede this real message).  */
 	  return 1;
 	}
+      struct timespec end;
+      clock_gettime (CLOCK_MONOTONIC, &end);
+      fprintf (stderr, "0 < winsdown = %d: %.3g ms\n\n",
+	       kbdhook.winsdown,
+	       (double)(end.tv_nsec - begin.tv_nsec)/1000000);
     }
 
   /* Next, handle the registered Alt-* combinations.  */
@@ -2905,6 +2938,7 @@ reset_w32_kbdhook_state (void)
   kbdhook.send_win_up = 0;
   kbdhook.suppress_lone = 0;
   kbdhook.winseen = 0;
+  fprintf (stderr, "Resetting state\n");
 }
 
 /* GetKeyState and MapVirtualKey on Windows 95 do not actually distinguish
@@ -3526,6 +3560,7 @@ send_deferred_msg (deferred_msg * msg_buf,
 		   WPARAM wParam,
 		   LPARAM lParam)
 {
+  fprintf(stderr, "Sending deferred message\n");
   /* Only input thread can send deferred messages.  */
   if (GetCurrentThreadId () != dwWindowsThreadId)
     emacs_abort ();
@@ -4343,6 +4378,7 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 	case VK_LWIN:
 	  if (!w32_kbdhook_active && NILP (Vw32_pass_lwindow_to_system))
 	    {
+	      fprintf (stderr, "kbdhook not active, processing VK_LWIN\n");
 	      /* Prevent system from acting on keyup (which opens the
 		 Start menu if no other key was pressed) by simulating a
 		 press of Space which we will ignore.  */
@@ -4362,6 +4398,7 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 	case VK_RWIN:
 	  if (!w32_kbdhook_active && NILP (Vw32_pass_rwindow_to_system))
 	    {
+	      fprintf (stderr, "kbdhook not active, processing VK_RWIN\n");
 	      if (GetAsyncKeyState (wParam) & 1)
 		{
 		  if (FIXNUMP (Vw32_phantom_key_code))