diff --git a/src/d_main.cpp b/src/d_main.cpp
index b4b6947a6..fbc47da4c 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -670,6 +670,8 @@ void D_Display ()
 	cycles.Reset();
 	cycles.Clock();
 
+	r_UseVanillaTransparency = UseVanillaTransparency(); // [SP] Cache UseVanillaTransparency() call
+
 	if (players[consoleplayer].camera == NULL)
 	{
 		players[consoleplayer].camera = players[consoleplayer].mo;
diff --git a/src/gl/scene/gl_sprite.cpp b/src/gl/scene/gl_sprite.cpp
index 0c0513dde..c49845688 100644
--- a/src/gl/scene/gl_sprite.cpp
+++ b/src/gl/scene/gl_sprite.cpp
@@ -76,7 +76,6 @@ CUSTOM_CVAR(Int, gl_fuzztype, 0, CVAR_ARCHIVE)
 }
 
 EXTERN_CVAR (Float, transsouls)
-EXTERN_CVAR (Bool, r_vanillatrans)
 
 extern TArray<spritedef_t> sprites;
 extern TArray<spriteframe_t> SpriteFrames;
@@ -994,7 +993,7 @@ void GLSprite::Process(AActor* thing, sector_t * sector, int thruportal)
 	{
 		trans = 1.f;
 	}
-	if (UseVanillaTransparency())
+	if (r_UseVanillaTransparency)
 	{
 		// [SP] "canonical transparency" - with the flip of a CVar, disable transparency for Doom objects,
 		//   and disable 'additive' translucency for certain objects from other games.
diff --git a/src/polyrenderer/scene/poly_sprite.cpp b/src/polyrenderer/scene/poly_sprite.cpp
index fc866b4e7..5b4927431 100644
--- a/src/polyrenderer/scene/poly_sprite.cpp
+++ b/src/polyrenderer/scene/poly_sprite.cpp
@@ -32,7 +32,6 @@
 
 EXTERN_CVAR(Float, transsouls)
 EXTERN_CVAR(Int, r_drawfuzz)
-EXTERN_CVAR (Bool, r_vanillatrans)
 
 bool RenderPolySprite::GetLine(AActor *thing, DVector2 &left, DVector2 &right)
 {
@@ -147,7 +146,7 @@ void RenderPolySprite::Render(const TriMatrix &worldToClip, const PolyClipPlane
 	args.SetStencilTestValue(stencilValue);
 	args.SetWriteStencil(true, stencilValue);
 	args.SetClipPlane(clipPlane);
-	if ((thing->renderflags & RF_ZDOOMTRANS) && UseVanillaTransparency())
+	if ((thing->renderflags & RF_ZDOOMTRANS) && r_UseVanillaTransparency)
 		args.SetStyle(LegacyRenderStyles[STYLE_Normal], 1.0f, thing->fillcolor, thing->Translation, tex, fullbrightSprite);
 	else
 		args.SetStyle(thing->RenderStyle, thing->Alpha, thing->fillcolor, thing->Translation, tex, fullbrightSprite);
diff --git a/src/r_data/r_vanillatrans.cpp b/src/r_data/r_vanillatrans.cpp
index 01d996d49..6bf897951 100644
--- a/src/r_data/r_vanillatrans.cpp
+++ b/src/r_data/r_vanillatrans.cpp
@@ -32,7 +32,8 @@
 #include "c_dispatch.h"
 #endif
 
-CVAR (Int, r_vanillatrans, 2, CVAR_ARCHIVE)
+bool r_UseVanillaTransparency;
+CVAR (Int, r_vanillatrans, 0, CVAR_ARCHIVE)
 
 namespace
 {
diff --git a/src/r_data/r_vanillatrans.h b/src/r_data/r_vanillatrans.h
index 5bf1892c7..8fc88b5d7 100644
--- a/src/r_data/r_vanillatrans.h
+++ b/src/r_data/r_vanillatrans.h
@@ -22,4 +22,5 @@
 
 
 void UpdateVanillaTransparency();
-bool UseVanillaTransparency();
\ No newline at end of file
+bool UseVanillaTransparency();
+extern bool r_UseVanillaTransparency;
diff --git a/src/swrenderer/things/r_sprite.cpp b/src/swrenderer/things/r_sprite.cpp
index 7defbac4a..25cfd58f3 100644
--- a/src/swrenderer/things/r_sprite.cpp
+++ b/src/swrenderer/things/r_sprite.cpp
@@ -69,7 +69,6 @@
 
 EXTERN_CVAR(Bool, r_fullbrightignoresectorcolor)
 EXTERN_CVAR(Bool, gl_light_sprites)
-EXTERN_CVAR (Bool, r_vanillatrans)
 
 namespace swrenderer
 {
@@ -214,7 +213,7 @@ namespace swrenderer
 		if (thing->flags5 & MF5_BRIGHT)
 			vis->renderflags |= RF_FULLBRIGHT; // kg3D
 		vis->RenderStyle = thing->RenderStyle;
-		if (UseVanillaTransparency())
+		if (r_UseVanillaTransparency)
 		{
 			if (thing->renderflags & RF_ZDOOMTRANS)
 				vis->RenderStyle = LegacyRenderStyles[STYLE_Normal];