diff --git a/src/d_main.c b/src/d_main.c
index 0281ef86c..126fc60de 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -148,7 +148,6 @@ event_t events[MAXEVENTS];
 INT32 eventhead, eventtail;
 
 boolean dedicated = false;
-boolean tic_happened = false; // Frame interpolation/uncapped
 
 //
 // D_PostEvent
@@ -782,13 +781,25 @@ void D_SRB2Loop(void)
 			realtics = 1;
 
 		// process tics (but maybe not if realtic == 0)
-		tic_happened = realtics ? true : false;
 		TryRunTics(realtics);
 
 		if (cv_frameinterpolation.value == 1)
-			rendertimefrac = I_GetTimeFrac();
+		{
+			fixed_t entertimefrac = I_GetTimeFrac();
+			// renderdeltatics is a bit awkard to evaluate, since the system time interface is whole tic-based
+			renderdeltatics = realtics * FRACUNIT;
+			if (entertimefrac > rendertimefrac)
+				renderdeltatics += entertimefrac - rendertimefrac;
+			else
+				renderdeltatics -= rendertimefrac - entertimefrac;
+
+			rendertimefrac = entertimefrac;
+		}
 		else
+		{
 			rendertimefrac = FRACUNIT;
+			renderdeltatics = realtics * FRACUNIT;
+		}
 
 		if (cv_frameinterpolation.value == 1)
 		{
diff --git a/src/d_main.h b/src/d_main.h
index a06334b6e..8189a9f2b 100644
--- a/src/d_main.h
+++ b/src/d_main.h
@@ -26,7 +26,6 @@ extern char srb2home[256]; //Alam: My Home
 extern boolean usehome; //Alam: which path?
 extern const char *pandf; //Alam: how to path?
 extern char srb2path[256]; //Alam: SRB2's Home
-extern boolean tic_happened; // Frame interpolation/uncapped
 
 // the infinite loop of D_SRB2Loop() called from win_main for windows version
 void D_SRB2Loop(void) FUNCNORETURN;
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 968ebc54e..d9c32d46b 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -6714,7 +6714,7 @@ void HWR_DoPostProcessor(player_t *player)
 		// 10 by 10 grid. 2 coordinates (xy)
 		float v[SCREENVERTS][SCREENVERTS][2];
 		static double disStart = 0;
-		static float last_fractime = 0;
+		static fixed_t last_fractime = 0;
 
 		UINT8 x, y;
 		INT32 WAVELENGTH;
@@ -6747,16 +6747,15 @@ void HWR_DoPostProcessor(player_t *player)
 		HWD.pfnPostImgRedraw(v);
 		if (!(paused || P_AutoPause()))
 			disStart += 1;
-		fixed_t fractime = I_GetTimeFrac();
-		if (tic_happened)
+		if (renderdeltatics > FRACUNIT)
 		{
-			disStart = disStart - last_fractime + 1 + FIXED_TO_FLOAT(fractime);
+			disStart = disStart - FIXED_TO_FLOAT(last_fractime) + 1 + FIXED_TO_FLOAT(rendertimefrac);
 		}
 		else
 		{
-			disStart = disStart - last_fractime + FIXED_TO_FLOAT(fractime);
+			disStart = disStart - FIXED_TO_FLOAT(last_fractime) + FIXED_TO_FLOAT(rendertimefrac);
 		}
-		last_fractime = fractime;
+		last_fractime = rendertimefrac;
 
 		// Capture the screen again for screen waving on the intermission
 		if(gamestate != GS_INTERMISSION)
diff --git a/src/m_menu.c b/src/m_menu.c
index ce38f81af..52c49ecba 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -207,17 +207,17 @@ menu_t SPauseDef;
 static levelselect_t levelselect = {0, NULL};
 static UINT8 levelselectselect[3];
 static patch_t *levselp[2][3];
-static INT32 lsoffs[2];
+static fixed_t lsoffs[2];
 
 #define lsrow levelselectselect[0]
 #define lscol levelselectselect[1]
 #define lshli levelselectselect[2]
 
 #define lshseperation 101
-#define lsbasevseperation (62*vid.height)/(BASEVIDHEIGHT*vid.dupy) //62
+#define lsbasevseperation ((62*vid.height)/(BASEVIDHEIGHT*vid.dupy)) //62
 #define lsheadingheight 16
 #define getheadingoffset(row) (levelselect.rows[row].header[0] ? lsheadingheight : 0)
-#define lsvseperation(row) lsbasevseperation + getheadingoffset(row)
+#define lsvseperation(row) (lsbasevseperation + getheadingoffset(row))
 #define lswide(row) levelselect.rows[row].mapavailable[3]
 
 #define lsbasex 19
@@ -5504,7 +5504,7 @@ static void M_HandleLevelPlatter(INT32 choice)
 				{
 					if (!lsoffs[0]) // prevent sound spam
 					{
-						lsoffs[0] = -8;
+						lsoffs[0] = -8 * FRACUNIT;
 						S_StartSound(NULL,sfx_s3kb7);
 					}
 					return;
@@ -5513,7 +5513,7 @@ static void M_HandleLevelPlatter(INT32 choice)
 			}
 			lsrow++;
 
-			lsoffs[0] = lsvseperation(lsrow);
+			lsoffs[0] = lsvseperation(lsrow) * FRACUNIT;
 
 			if (levelselect.rows[lsrow].header[0])
 				lshli = lsrow;
@@ -5532,7 +5532,7 @@ static void M_HandleLevelPlatter(INT32 choice)
 				{
 					if (!lsoffs[0]) // prevent sound spam
 					{
-						lsoffs[0] = 8;
+						lsoffs[0] = 8 * FRACUNIT;
 						S_StartSound(NULL,sfx_s3kb7);
 					}
 					return;
@@ -5541,7 +5541,7 @@ static void M_HandleLevelPlatter(INT32 choice)
 			}
 			lsrow--;
 
-			lsoffs[0] = -lsvseperation(iter);
+			lsoffs[0] = -lsvseperation(iter) * FRACUNIT;
 
 			if (levelselect.rows[lsrow].header[0])
 				lshli = lsrow;
@@ -5582,7 +5582,7 @@ static void M_HandleLevelPlatter(INT32 choice)
 				}
 				else if (!lsoffs[0]) // prevent sound spam
 				{
-					lsoffs[0] = -8;
+					lsoffs[0] = -8 * FRACUNIT;
 					S_StartSound(NULL,sfx_s3kb2);
 				}
 				break;
@@ -5608,14 +5608,14 @@ static void M_HandleLevelPlatter(INT32 choice)
 			{
 				lscol++;
 
-				lsoffs[1] = (lswide(lsrow) ? 8 : -lshseperation);
+				lsoffs[1] = (lswide(lsrow) ? 8 : -lshseperation) * FRACUNIT;
 				S_StartSound(NULL,sfx_s3kb7);
 
 				ifselectvalnextmap(lscol) else ifselectvalnextmap(0)
 			}
 			else if (!lsoffs[1]) // prevent sound spam
 			{
-				lsoffs[1] = 8;
+				lsoffs[1] = 8 * FRACUNIT;
 				S_StartSound(NULL,sfx_s3kb7);
 			}
 			break;
@@ -5640,14 +5640,14 @@ static void M_HandleLevelPlatter(INT32 choice)
 			{
 				lscol--;
 
-				lsoffs[1] = (lswide(lsrow) ? -8 : lshseperation);
+				lsoffs[1] = (lswide(lsrow) ? -8 : lshseperation) * FRACUNIT;
 				S_StartSound(NULL,sfx_s3kb7);
 
 				ifselectvalnextmap(lscol) else ifselectvalnextmap(0)
 			}
 			else if (!lsoffs[1]) // prevent sound spam
 			{
-				lsoffs[1] = -8;
+				lsoffs[1] = -8 * FRACUNIT;
 				S_StartSound(NULL,sfx_s3kb7);
 			}
 			break;
@@ -5946,7 +5946,7 @@ static void M_DrawNightsAttackSuperSonic(void)
 static void M_DrawLevelPlatterMenu(void)
 {
 	UINT8 iter = lsrow, sizeselect = (lswide(lsrow) ? 1 : 0);
-	INT32 y = lsbasey + lsoffs[0] - getheadingoffset(lsrow);
+	INT32 y = lsbasey + FixedInt(lsoffs[0]) - getheadingoffset(lsrow);
 	const INT32 cursorx = (sizeselect ? 0 : (lscol*lshseperation));
 
 	if (currentMenu->prevMenu == &SP_TimeAttackDef)
@@ -6014,7 +6014,7 @@ static void M_DrawLevelPlatterMenu(void)
 
 	// draw cursor box
 	if (levellistmode != LLM_CREATESERVER || lsrow)
-		V_DrawSmallScaledPatch(lsbasex + cursorx + lsoffs[1], lsbasey+lsoffs[0], 0, (levselp[sizeselect][((skullAnimCounter/4) ? 1 : 0)]));
+		V_DrawSmallScaledPatch(lsbasex + cursorx + FixedInt(lsoffs[1]), lsbasey+FixedInt(lsoffs[0]), 0, (levselp[sizeselect][((skullAnimCounter/4) ? 1 : 0)]));
 
 #if 0
 	if (levelselect.rows[lsrow].maplist[lscol] > 0)
@@ -6022,13 +6022,26 @@ static void M_DrawLevelPlatterMenu(void)
 #endif
 
 	// handle movement of cursor box
-	if (lsoffs[0] > 1 || lsoffs[0] < -1)
-		lsoffs[0] = 2*lsoffs[0]/3;
+	fixed_t cursormovefrac = FixedDiv(2, 3);
+	if (lsoffs[0] > FRACUNIT || lsoffs[0] < -FRACUNIT)
+	{
+		fixed_t offs = lsoffs[0];
+		fixed_t newoffs = FixedMul(offs, cursormovefrac);
+		fixed_t deltaoffs = newoffs - offs;
+		newoffs = offs + FixedMul(deltaoffs, renderdeltatics);
+		lsoffs[0] = newoffs;
+	}
 	else
 		lsoffs[0] = 0;
 
-	if (lsoffs[1] > 1 || lsoffs[1] < -1)
-		lsoffs[1] = 2*lsoffs[1]/3;
+	if (lsoffs[1] > FRACUNIT || lsoffs[1] < -FRACUNIT)
+	{
+		fixed_t offs = lsoffs[1];
+		fixed_t newoffs = FixedMul(offs, cursormovefrac);
+		fixed_t deltaoffs = newoffs - offs;
+		newoffs = offs + FixedMul(deltaoffs, renderdeltatics);
+		lsoffs[1] = newoffs;
+	}
 	else
 		lsoffs[1] = 0;
 
diff --git a/src/r_main.c b/src/r_main.c
index fe5daa00b..249607480 100644
--- a/src/r_main.c
+++ b/src/r_main.c
@@ -77,6 +77,7 @@ player_t *viewplayer;
 mobj_t *r_viewmobj;
 
 fixed_t rendertimefrac;
+fixed_t renderdeltatics;
 
 //
 // precalculated math tables
diff --git a/src/r_main.h b/src/r_main.h
index 860bfa920..45254f6c4 100644
--- a/src/r_main.h
+++ b/src/r_main.h
@@ -35,7 +35,10 @@ extern fixed_t fovtan;
 
 extern size_t validcount, linecount, loopcount, framecount;
 
+// The fraction of a tic being drawn (for interpolation between two tics)
 extern fixed_t rendertimefrac;
+// Evaluated delta tics for this frame (how many tics since the last frame)
+extern fixed_t renderdeltatics;;
 
 //
 // Lighting LUT.