diff --git a/src/core/FileLoader.cpp b/src/core/FileLoader.cpp
index ff50575f..aadafc29 100644
--- a/src/core/FileLoader.cpp
+++ b/src/core/FileLoader.cpp
@@ -1,6 +1,7 @@
 #include "common.h"
 #include "main.h"
 
+#include "General.h"
 #include "Quaternion.h"
 #include "ModelInfo.h"
 #include "ModelIndices.h"
@@ -449,6 +450,334 @@ CFileLoader::LoadAtomicFile(RwStream *stream, uint32 id)
 	return true;
 }
 
+#ifdef HARDCODED_MODEL_FLAGS
+char *DoubleSidedNames[] = {
+	"chnabankdoor",
+	"Security_Hut",
+	"Hospital_Sub",
+	"phonebooth1",
+	"trafficlight1",
+	"sub_roadbarrier",
+	"redlightbuild09",
+	"doublestreetlght1",
+	"doc_shedbig31",
+	"com_land_128",
+	"garage7",
+	"proj_garage01",
+	"buildingground2",
+	"buildingground3",
+	"ch_roof_kb",
+	"overpassind",
+	"casino",
+	"ind_land100",
+	"fuckedup_skewlbus",
+	"Police_Station_ind",
+	"flagsitaly",
+	"sidebarrier_gaz1",
+	"bar_barrier12",
+	"bar_barrier10b",
+	"sidebarrier_gaz2",
+	"doc_shedbig3",
+	"doc_shedbig4",
+	"verticalift_bridge",
+	"verticalift_bridg2",
+	"usdcrdlrbuild01",
+	"apairporthanger",
+	"apairporthangerA",
+	"porthangerclosed",
+	"redlightbuild13",
+	"doc_rave",
+	"const_woodfence",
+	"const_woodfence2",
+	"const_woodfence3",
+	"subfraightback01",
+	"subfraightback02",
+	"subfraightback03",
+	"subfraightback04",
+	"subind_build03",
+	"chinabanner1",
+	"chinabanner2",
+	"chinabanner3",
+	"chinabanner4",
+	"Pumpfirescape",
+	"Pumphouse",
+	"amcounder",
+	"barrel1",
+	"barrel2",
+	"barrel3",
+	"barrel4",
+	"com_1way50",
+	"com_1way20",
+	"overpasscom01",
+	"overpasscom02",
+	"overpasscom03",
+	"overpasscom04",
+	"overpass_comse",
+	"newdockbuilding",
+	"newdockbuilding2",
+	"newdockbuilding",
+	"policeballhall",
+	"fuzballdoor",
+	"ind_land106",
+	"PoliceBallSigns",
+	"amcoudet",
+	"rustship_structure",
+	"impexpgrgesub",
+	"ind_land128",
+	"fshfctry_dstryd",
+	"railtrax_bentl",
+	"railtrax_lo4b",
+	"railtrax_straight",
+	"railtrax_bentrb",
+	"railtrax_skew",
+	"newtrackaaa",
+	"railtrax_skew5",
+	// these they forgot:
+	"railtrax_skewp",
+	"railtrax_ske2b",
+	"railtrax_strtshort",
+	"railtrax_2b",
+	"railtrax_straightss",
+	"railtrax_bentr",
+	""
+};
+char *TreeNames[] = {
+	"coast_treepatch",
+	"comparknewtrees",
+	"comtreepatchprk",
+	"condotree01",
+	"condotree1",
+	"indatree03",
+	"indtreepatch5",
+	"indtreepatch06f",
+	"new_carprktrees",
+	"new_carprktrees4",
+	"newcoasttrees1",
+	"newcoasttrees2",
+	"newcoasttrees3",
+	"newtreepatch_sub",
+	"newtrees1_sub",
+	"newunitrepatch",
+	"pinetree_narrow",
+	"pinetree_wide",
+	"treencom2",
+	"treepatch",
+	"treepatch01_sub",
+	"treepatch02_sub",
+	"treepatch2",
+	"treepatch2b",
+	"treepatch03",
+	"treepatch03_sub",
+	"treepatch04_sub",
+	"treepatch05_sub",
+	"treepatch06_sub",
+	"treepatch07_sub",
+	"treepatch08_sub",
+	"treepatch09_sub",
+	"treepatch10_sub",
+	"treepatch11_sub",
+	"treepatch12_sub",
+	"treepatch13_sub",
+	"treepatch14_sub",
+	"treepatch15_sub",
+	"treepatch16_sub",
+	"treepatch17_sub",
+	"treepatch18_sub",
+	"treepatch19_sub",
+	"treepatch20_sub",
+	"treepatch21_sub",
+	"treepatch22_sub",
+	"treepatch23_sub",
+	"treepatch24_sub",
+	"treepatch25_sub",
+	"treepatch26_sub",
+	"treepatch27_sub",
+	"treepatch28_sub",
+	"treepatch29_sub",
+	"treepatch30_sub",
+	"treepatch31_sub",
+	"treepatch32_sub",
+	"treepatch33_sub",
+	"treepatch34_sub",
+	"treepatch35_sub",
+	"treepatch69",
+	"treepatch152_sub",
+	"treepatch153_sub",
+	"treepatch171_sub",
+	"treepatch172_sub",
+	"treepatch173_sub",
+	"treepatch212_sub",
+	"treepatch213_sub",
+	"treepatch214_sub",
+	"treepatcha",
+	"treepatchb",
+	"treepatchcomtop1",
+	"treepatchd",
+	"treepatche",
+	"treepatchh",
+	"treepatchindaa2",
+	"treepatchindnew",
+	"treepatchindnew2",
+	"treepatchk",
+	"treepatchkb4",
+	"treepatchkb5",
+	"treepatchkb6",
+	"treepatchkb7",
+	"treepatchkb9",
+	"treepatchl",
+	"treepatchm",
+	"treepatchnew_sub",
+	"treepatchttwrs",
+	"treesuni1",
+	"trepatchindaa1",
+	"veg_bush2",
+	"veg_bush14",
+	"veg_tree1",
+	"veg_tree3",
+	"veg_treea1",
+	"veg_treea3",
+	"veg_treeb1",
+	"veg_treenew01",
+	"veg_treenew03",
+	"veg_treenew05",
+	"veg_treenew06",
+	"veg_treenew08",
+	"veg_treenew09",
+	"veg_treenew10",
+	"veg_treenew16",
+	"veg_treenew17",
+	"vegclubtree01",
+	"vegclubtree02",
+	"vegclubtree03",
+	"vegpathtree",
+	""
+};
+char *OptimizedNames[] = {
+	"coast_treepatch",
+	"comparknewtrees",
+	"comtreepatchprk",
+	"indtreepatch5",
+	"indtreepatch06f",
+	"new_carprktrees",
+	"new_carprktrees4",
+	"newcoasttrees1",
+	"newcoasttrees2",
+	"newcoasttrees3",
+	"newtreepatch_sub",
+	"newtrees1_sub",
+	"newunitrepatch",
+	"treepatch",
+	"treepatch01_sub",
+	"treepatch02_sub",
+	"treepatch2",
+	"treepatch2b",
+	"treepatch03",
+	"treepatch03_sub",
+	"treepatch04_sub",
+	"treepatch05_sub",
+	"treepatch06_sub",
+	"treepatch07_sub",
+	"treepatch08_sub",
+	"treepatch09_sub",
+	"treepatch10_sub",
+	"treepatch11_sub",
+	"treepatch12_sub",
+	"treepatch13_sub",
+	"treepatch14_sub",
+	"treepatch15_sub",
+	"treepatch16_sub",
+	"treepatch17_sub",
+	"treepatch18_sub",
+	"treepatch19_sub",
+	"treepatch20_sub",
+	"treepatch21_sub",
+	"treepatch22_sub",
+	"treepatch23_sub",
+	"treepatch24_sub",
+	"treepatch25_sub",
+	"treepatch26_sub",
+	"treepatch27_sub",
+	"treepatch28_sub",
+	"treepatch29_sub",
+	"treepatch30_sub",
+	"treepatch31_sub",
+	"treepatch32_sub",
+	"treepatch33_sub",
+	"treepatch34_sub",
+	"treepatch35_sub",
+	"treepatch69",
+	"treepatch152_sub",
+	"treepatch153_sub",
+	"treepatch171_sub",
+	"treepatch172_sub",
+	"treepatch173_sub",
+	"treepatch212_sub",
+	"treepatch213_sub",
+	"treepatch214_sub",
+	"treepatcha",
+	"treepatchb",
+	"treepatchcomtop1",
+	"treepatchd",
+	"treepatche",
+	"treepatchh",
+	"treepatchindaa2",
+	"treepatchindnew",
+	"treepatchindnew2",
+	"treepatchk",
+	"treepatchkb4",
+	"treepatchkb5",
+	"treepatchkb6",
+	"treepatchkb7",
+	"treepatchkb9",
+	"treepatchl",
+	"treepatchm",
+	"treepatchnew_sub",
+	"treepatchttwrs",
+	"treesuni1",
+	"trepatchindaa1",
+	"combtm_treeshad01",
+	"combtm_treeshad02",
+	"combtm_treeshad03",
+	"combtm_treeshad04",
+	"combtm_treeshad05",
+	"combtm_treeshad06",
+	"comtop_tshad",
+	"comtop_tshad2",
+	"comtop_tshad3",
+	"comtop_tshad4",
+	"comtop_tshad5",
+	"comtop_tshad6",
+	"se_treeshad01",
+	"se_treeshad02",
+	"se_treeshad03",
+	"se_treeshad04",
+	"se_treeshad05",
+	"se_treeshad06",
+	"treeshads01",
+	"treeshads02",
+	"treeshads03",
+	"treeshads04",
+	"treeshads05",
+	""
+};
+// not from mobile
+static bool
+MatchModelName(char *name, char **list)
+{
+	int i;
+	char *s;
+	for(i = 0; *list[i] != '\0'; i++)
+		if(strncmp(name, "LOD", 3) == 0){
+			if(!CGeneral::faststricmp(name+3, list[i]+3))
+				return true;
+		}else{
+			if(!CGeneral::faststricmp(name, list[i]))
+				return true;
+		}
+	return false;
+}
+#endif
+
 RpAtomic*
 CFileLoader::SetRelatedModelInfoCB(RpAtomic *atomic, void *data)
 {
@@ -600,6 +929,21 @@ SetModelInfoFlags(CSimpleModelInfo *mi, uint32 flags)
 	mi->m_isSubway =	!!(flags & 0x10);
 	mi->m_ignoreLight =	!!(flags & 0x20);
 	mi->m_noZwrite =	!!(flags & 0x40);
+#ifdef EXTRA_MODEL_FLAGS
+	// same flag values as SA
+	mi->m_bIsTree =        !!(flags & 0x2000);
+	mi->m_bIsDoubleSided = !!(flags & 0x200000);
+	// new value otherwise unused
+	mi->m_bCanBeIgnored =  !!(flags & 0x10000);
+
+#ifdef HARDCODED_MODEL_FLAGS
+	// mobile sets these flags in CFileLoader::SetRelatedModelInfoCB, but that's stupid
+	if(MatchModelName(mi->GetName(), DoubleSidedNames)) mi->m_bIsDoubleSided = true;
+	if(MatchModelName(mi->GetName(), TreeNames)) mi->m_bIsTree = true;
+	if(MatchModelName(mi->GetName(), OptimizedNames)) mi->m_bCanBeIgnored = true;
+#endif
+
+#endif
 }
 
 void
diff --git a/src/core/config.h b/src/core/config.h
index 171c6be9..fd89391b 100644
--- a/src/core/config.h
+++ b/src/core/config.h
@@ -201,6 +201,9 @@ enum Config {
 #define LOAD_INI_SETTINGS
 
 // Rendering/display
+#define EXTRA_MODEL_FLAGS	// from mobile to optimize rendering
+# define HARDCODED_MODEL_FLAGS	// sets the flags enabled above from hardcoded model names.
+				// NB: keep this enabled unless your map IDEs have these flags baked in
 #define ASPECT_RATIO_SCALE	// Not just makes everything scale with aspect ratio, also adds support for all aspect ratios
 #define DEFAULT_NATIVE_RESOLUTION	// Set default video mode to your native resolution (fixes Windows 10 launch)
 #define USE_TXD_CDIMAGE		// generate and load textures from txd.img
diff --git a/src/extras/custompipes.cpp b/src/extras/custompipes.cpp
index b545b4d8..8c2b6916 100644
--- a/src/extras/custompipes.cpp
+++ b/src/extras/custompipes.cpp
@@ -337,7 +337,7 @@ ReadTweakValueTable(char *fp, InterpolatedValue &interp)
  * Neo Vehicle pipe
  */
 
-int32 VehiclePipeSwitch = VEHICLEPIPE_NEO;
+int32 VehiclePipeSwitch = VEHICLEPIPE_MATFX;
 float VehicleShininess = 0.7f;	// the default is a bit extreme
 float VehicleSpecularity = 1.0f;
 InterpolatedFloat Fresnel(0.4f);
diff --git a/src/modelinfo/BaseModelInfo.h b/src/modelinfo/BaseModelInfo.h
index 783f871f..2505967b 100644
--- a/src/modelinfo/BaseModelInfo.h
+++ b/src/modelinfo/BaseModelInfo.h
@@ -31,6 +31,14 @@ protected:
 	ModelInfoType m_type;
 	uint8        m_num2dEffects;
 	bool         m_bOwnsColModel;
+#ifdef EXTRA_MODEL_FLAGS
+public:
+	// from mobile
+	bool         m_bIsDoubleSided;
+	bool         m_bIsTree;
+	bool         m_bCanBeIgnored;	// for low-end devices
+	bool RenderDoubleSided(void) { return m_bIsDoubleSided || m_bIsTree; }
+#endif
 
 public:
 	CBaseModelInfo(ModelInfoType type);
diff --git a/src/render/Renderer.cpp b/src/render/Renderer.cpp
index 8c194067..4ad1d3b9 100644
--- a/src/render/Renderer.cpp
+++ b/src/render/Renderer.cpp
@@ -53,6 +53,14 @@ CVehicle *CRenderer::m_pFirstPersonVehicle;
 bool CRenderer::m_loadingPriority;
 float CRenderer::ms_lodDistScale = 1.2f;
 
+#ifdef EXTRA_MODEL_FLAGS
+#define BACKFACE_CULLING_ON SetCullMode(rwCULLMODECULLBACK)
+#define BACKFACE_CULLING_OFF SetCullMode(rwCULLMODECULLNONE)
+#else
+#define BACKFACE_CULLING_ON
+#define BACKFACE_CULLING_OFF
+#endif
+
 void
 CRenderer::Init(void)
 {
@@ -101,6 +109,13 @@ CRenderer::RenderOneRoad(CEntity *e)
 	else{
 #ifdef EXTENDED_PIPELINES
 		CustomPipes::AttachGlossPipe(e->GetAtomic());
+#endif
+#ifdef EXTRA_MODEL_FLAGS
+	if(CModelInfo::GetModelInfo(e->GetModelIndex())->RenderDoubleSided()){
+		BACKFACE_CULLING_OFF;
+		e->Render();
+		BACKFACE_CULLING_ON;
+	}else
 #endif
 		e->Render();
 	}
@@ -163,13 +178,22 @@ CRenderer::RenderOneNonRoad(CEntity *e)
 		for(i = 0; i < 8; i++)
 			if(veh->pPassengers[i] && veh->pPassengers[i]->m_nPedState == PED_DRIVING)
 				veh->pPassengers[i]->Render();
+		BACKFACE_CULLING_OFF;
 	}
+#ifdef EXTRA_MODEL_FLAGS
+	if(CModelInfo::GetModelInfo(e->GetModelIndex())->RenderDoubleSided()){
+		BACKFACE_CULLING_OFF;
+		e->Render();
+		BACKFACE_CULLING_ON;
+	}else
+#endif
 	e->Render();
 
 	if(e->IsVehicle()){
 		e->bImBeingRendered = true;
 		CVisibilityPlugins::RenderAlphaAtomics();
 		e->bImBeingRendered = false;
+		BACKFACE_CULLING_ON;
 	}
 
 	e->RemoveLighting(resetLights);
@@ -197,6 +221,7 @@ CRenderer::RenderRoads(void)
 	CTreadable *t;
 
 	RwRenderStateSet(rwRENDERSTATEFOGENABLE, (void*)TRUE);
+	BACKFACE_CULLING_ON;
 	DeActivateDirectional();
 	SetAmbientColours();
 
@@ -230,6 +255,7 @@ CRenderer::RenderEverythingBarRoads(void)
 	CVector dist;
 	EntityInfo ei;
 
+	BACKFACE_CULLING_ON;
 	gSortedVehiclesAndPeds.Clear();
 
 	for(i = 0; i < ms_nNoOfVisibleEntities; i++){
@@ -284,6 +310,8 @@ CRenderer::RenderBoats(void)
 {
 	CLink<EntityInfo> *node;
 
+	BACKFACE_CULLING_ON;
+
 	for(node = gSortedVehiclesAndPeds.tail.prev;
 	    node != &gSortedVehiclesAndPeds.head;
 	    node = node->prev){
@@ -298,6 +326,7 @@ void
 CRenderer::RenderFadingInEntities(void)
 {
 	RwRenderStateSet(rwRENDERSTATEFOGENABLE, (void*)TRUE);
+	BACKFACE_CULLING_ON;
 	DeActivateDirectional();
 	SetAmbientColours();
 	CVisibilityPlugins::RenderFadingEntities();
diff --git a/src/rw/RwHelper.cpp b/src/rw/RwHelper.cpp
index 4b598e9b..6a7010e2 100644
--- a/src/rw/RwHelper.cpp
+++ b/src/rw/RwHelper.cpp
@@ -3,6 +3,7 @@
 #endif
 #include "common.h"
 
+#include "RwHelper.h"
 #include "Timecycle.h"
 #include "skeleton.h"
 #include "Debug.h"
@@ -16,6 +17,7 @@ bool gPS2alphaTest = true;
 #else
 bool gPS2alphaTest = false;
 #endif
+bool gBackfaceCulling = true;
 
 #ifndef FINAL
 static bool charsetOpen;
@@ -121,14 +123,32 @@ DefinedState(void)
 
 #ifdef LIBRW
 	rw::SetRenderState(rw::ALPHATESTFUNC, rw::ALPHAGREATEREQUAL);
-	rw::SetRenderState(rw::ALPHATESTREF, 3);
 
 	rw::SetRenderState(rw::GSALPHATEST, gPS2alphaTest);
 #else
 	// D3D stuff
 	RwD3D8SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATER);
-	RwD3D8SetRenderState(D3DRS_ALPHAREF, 2);
 #endif
+	SetAlphaRef(2);
+}
+
+void
+SetAlphaRef(int ref)
+{
+#ifdef LIBRW
+	rw::SetRenderState(rw::ALPHATESTREF, ref+1);
+#else
+	RwD3D8SetRenderState(D3DRS_ALPHAREF, ref);
+#endif
+}
+
+void
+SetCullMode(uint32 mode)
+{
+	if(gBackfaceCulling)
+		RwRenderStateSet(rwRENDERSTATECULLMODE, (void*)mode);
+	else
+		RwRenderStateSet(rwRENDERSTATECULLMODE, (void*)rwCULLMODECULLNONE);
 }
 
 RwFrame*
diff --git a/src/rw/RwHelper.h b/src/rw/RwHelper.h
index eceaee07..130eb636 100644
--- a/src/rw/RwHelper.h
+++ b/src/rw/RwHelper.h
@@ -11,6 +11,8 @@ void DestroyDebugFont();
 void ObrsPrintfString(const char *str, short x, short y);
 void FlushObrsPrintfs();
 void DefinedState(void);
+void SetAlphaRef(int ref);
+void SetCullMode(uint32 mode);
 RwFrame *GetFirstChild(RwFrame *frame);
 RwObject *GetFirstObject(RwFrame *frame);
 RpAtomic *GetFirstAtomic(RpClump *clump);
diff --git a/src/rw/VisibilityPlugins.cpp b/src/rw/VisibilityPlugins.cpp
index b2e252a0..c47cedca 100644
--- a/src/rw/VisibilityPlugins.cpp
+++ b/src/rw/VisibilityPlugins.cpp
@@ -1,5 +1,6 @@
 #include "common.h"
 
+#include "RwHelper.h"
 #include "templates.h"
 #include "Entity.h"
 #include "ModelInfo.h"
@@ -158,6 +159,10 @@ CVisibilityPlugins::RenderFadingEntities(void)
 		if(mi->m_noZwrite)
 #endif
 			RwRenderStateSet(rwRENDERSTATEZWRITEENABLE, FALSE);
+#ifdef EXTRA_MODEL_FLAGS
+		if(mi->m_bIsTree)
+			SetAlphaRef(128);
+#endif
 
 		if(e->bDistanceFade){
 			DeActivateDirectional();
@@ -168,6 +173,10 @@ CVisibilityPlugins::RenderFadingEntities(void)
 		}else
 			CRenderer::RenderOneNonRoad(e);
 
+#ifdef EXTRA_MODEL_FLAGS
+		if(mi->m_bIsTree)
+			SetAlphaRef(2);
+#endif
 #ifdef FIX_BUGS
 		if(mi->GetModelType() == MITYPE_SIMPLE && mi->m_noZwrite)
 #else