diff --git a/src/crashlog.cpp b/src/crashlog.cpp
index ab8408772a..2653490dd3 100644
--- a/src/crashlog.cpp
+++ b/src/crashlog.cpp
@@ -234,6 +234,9 @@ char *CrashLog::LogConfiguration(char *buffer, const char *last) const
 	if (_settings_game.debug.chicken_bits != 0) {
 		buffer += seprintf(buffer, last, "Chicken bits: 0x%08X\n\n", _settings_game.debug.chicken_bits);
 	}
+	if (_settings_game.debug.newgrf_optimiser_flags != 0) {
+		buffer += seprintf(buffer, last, "NewGRF optimiser flags: 0x%08X\n\n", _settings_game.debug.newgrf_optimiser_flags);
+	}
 
 	buffer += seprintf(buffer, last, "AI Configuration (local: %i) (current: %i):\n", (int)_local_company, (int)_current_company);
 	for (const Company *c : Company::Iterate()) {
diff --git a/src/debug_settings.h b/src/debug_settings.h
index c724eeee87..e9db946533 100644
--- a/src/debug_settings.h
+++ b/src/debug_settings.h
@@ -20,10 +20,6 @@ enum ChickenBitFlags {
 	DCBF_DESYNC_CHECK_POST_COMMAND     = 3,
 	DCBF_DESYNC_CHECK_NO_GENERAL       = 4,
 	DCBF_DESYNC_CHECK_PERIODIC_SIGNALS = 5,
-	DCBF_NO_OPTIMISE_VARACT2           = 6,
-	DCBF_NO_OPTIMISE_VARACT2_DSE       = 7,
-	DCBF_NO_OPTIMISE_VARACT2_PRUNE     = 8,
-	DCBF_NO_OPTIMISE_VARACT2_EXP_VAR   = 9,
 };
 
 inline bool HasChickenBit(ChickenBitFlags flag)
@@ -31,6 +27,18 @@ inline bool HasChickenBit(ChickenBitFlags flag)
 	return HasBit(_settings_game.debug.chicken_bits, flag);
 }
 
+enum NewGRFOptimiserFlags {
+	NGOF_NO_OPT_VARACT2                = 0,
+	NGOF_NO_OPT_VARACT2_DSE            = 1,
+	NGOF_NO_OPT_VARACT2_GROUP_PRUNE    = 2,
+	NGOF_NO_OPT_VARACT2_EXPENSIVE_VARS = 3,
+};
+
+inline bool HasGrfOptimiserFlag(NewGRFOptimiserFlags flag)
+{
+	return HasBit(_settings_game.debug.newgrf_optimiser_flags, flag);
+}
+
 enum MiscDebugFlags {
 	MDF_OVERHEAT_BREAKDOWN_OPEN_WIN,
 	MDF_ZONING_RS_WATER_FLOOD_STATE,
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index dc9e65f511..e806f9c34c 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5536,7 +5536,7 @@ static const SpriteGroup *GetGroupFromGroupID(byte setid, byte type, uint16 grou
 	}
 
 	const SpriteGroup *result = _cur.spritegroups[groupid];
-	if (HasChickenBit(DCBF_NO_OPTIMISE_VARACT2) || HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_PRUNE)) return result;
+	if (HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2) || HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_GROUP_PRUNE)) return result;
 	while (result != nullptr) {
 		if (result->type == SGT_DETERMINISTIC) {
 			const DeterministicSpriteGroup *sg = static_cast<const DeterministicSpriteGroup *>(result);
@@ -5667,7 +5667,7 @@ static bool IsFeatureUsableForDSE(GrfSpecFeature feature)
 
 static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSpecFeature feature, const byte varsize, DeterministicSpriteGroup *group, DeterministicSpriteGroupAdjust &adjust)
 {
-	if (unlikely(HasChickenBit(DCBF_NO_OPTIMISE_VARACT2))) return;
+	if (unlikely(HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2))) return;
 
 	VarAction2AdjustInferenceFlags prev_inference = state.inference;
 	state.inference = VA2AIF_NONE;
@@ -6428,9 +6428,9 @@ static void OptimiseVarAction2DeterministicSpriteGroupExpensiveVars(const GrfSpe
 
 static void OptimiseVarAction2DeterministicSpriteGroup(VarAction2OptimiseState &state, const GrfSpecFeature feature, const byte varsize, DeterministicSpriteGroup *group)
 {
-	if (unlikely(HasChickenBit(DCBF_NO_OPTIMISE_VARACT2))) return;
+	if (unlikely(HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2))) return;
 
-	if (!HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_PRUNE) && (state.inference & VA2AIF_HAVE_CONSTANT) && !group->calculated_result) {
+	if (!HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_GROUP_PRUNE) && (state.inference & VA2AIF_HAVE_CONSTANT) && !group->calculated_result) {
 		/* Result of this sprite group is always the same, discard the unused branches */
 		const SpriteGroup *target = group->default_group;
 		for (const auto &range : group->ranges) {
@@ -6443,7 +6443,7 @@ static void OptimiseVarAction2DeterministicSpriteGroup(VarAction2OptimiseState &
 		group->ranges.clear();
 	}
 
-	if (!HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_PRUNE) && group->ranges.empty() && !group->calculated_result) {
+	if (!HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_GROUP_PRUNE) && group->ranges.empty() && !group->calculated_result) {
 		/* There is only one option, remove any redundant adjustments when the result will be ignored anyway */
 		while (!group->adjusts.empty()) {
 			const DeterministicSpriteGroupAdjust &prev = group->adjusts.back();
@@ -6521,8 +6521,8 @@ static void OptimiseVarAction2DeterministicSpriteGroup(VarAction2OptimiseState &
 	bool dse_candidate = false;
 	if (check_dse || state.seen_procedure_call) dse_candidate = CheckDeterministicSpriteGroupOutputVarBits(group, bits, check_dse, !state.seen_procedure_call);
 
-	if (state.check_expensive_vars && !HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_EXP_VAR)) {
-		if (dse_candidate && !HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_DSE)) {
+	if (state.check_expensive_vars && !HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_EXPENSIVE_VARS)) {
+		if (dse_candidate && !HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_DSE)) {
 			_cur.pending_expensive_var_checks.push_back({ feature, group });
 		} else {
 			OptimiseVarAction2DeterministicSpriteGroupExpensiveVars(feature, group);
@@ -6532,7 +6532,7 @@ static void OptimiseVarAction2DeterministicSpriteGroup(VarAction2OptimiseState &
 
 static void HandleVarAction2DeadStoreElimination()
 {
-	if (unlikely(HasChickenBit(DCBF_NO_OPTIMISE_VARACT2) || HasChickenBit(DCBF_NO_OPTIMISE_VARACT2_DSE))) return;
+	if (unlikely(HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2) || HasGrfOptimiserFlag(NGOF_NO_OPT_VARACT2_DSE))) return;
 
 	for (DeterministicSpriteGroup *group : _cur.dead_store_elimination_candidates) {
 		std::bitset<256> bits;
diff --git a/src/settings_type.h b/src/settings_type.h
index bde815dc52..13cce7b135 100644
--- a/src/settings_type.h
+++ b/src/settings_type.h
@@ -757,6 +757,7 @@ struct CompanySettings {
 /** Debug settings. */
 struct DebugSettings {
 	uint32 chicken_bits;                     ///< chicken bits
+	uint32 newgrf_optimiser_flags;           ///< NewGRF optimiser flags
 };
 
 /** Scenario editor settings. */
diff --git a/src/table/settings/settings.ini b/src/table/settings/settings.ini
index 874e7da594..7a0f789f55 100644
--- a/src/table/settings/settings.ini
+++ b/src/table/settings/settings.ini
@@ -5999,3 +5999,13 @@ min      = 0
 max      = 0xFFFFFFFF
 cat      = SC_EXPERT
 patxname = ""debug.chicken_bits""
+
+[SDT_VAR]
+var      = debug.newgrf_optimiser_flags
+type     = SLE_UINT32
+flags    = SF_NOT_IN_CONFIG | SF_NO_NEWGAME | SF_NO_NETWORK
+def      = 0
+min      = 0
+max      = 0xFFFFFFFF
+cat      = SC_EXPERT
+patxname = ""debug.newgrf_optimiser_flags""