diff --git a/eeschema/sim/sim_model.cpp b/eeschema/sim/sim_model.cpp
index 474909dbe6..fede1ecb4b 100644
--- a/eeschema/sim/sim_model.cpp
+++ b/eeschema/sim/sim_model.cpp
@@ -1064,10 +1064,35 @@ void SIM_MODEL::doWriteFields( std::vector<T>& aFields ) const
 
 bool SIM_MODEL::requiresSpiceModelLine( const SPICE_ITEM& aItem ) const
 {
-    for( const PARAM& param : GetParams() )
+    // Model must be written if there's no base model or the base model is an internal model
+    if( !m_baseModel || aItem.baseModelName == "" )
+        return true;
+
+    for( int ii = 0; ii < GetParamCount(); ++ii )
     {
-        if( !param.info.isSpiceInstanceParam )
-            return true;
+        const PARAM& param = m_params[ii];
+
+        // Instance parameters are written in item lines
+        if( param.info.isSpiceInstanceParam )
+            continue;
+
+        // Empty parameters are interpreted as default-value
+        if ( param.value == "" )
+            continue;
+
+        const SIM_MODEL* baseModel = dynamic_cast<const SIM_MODEL*>( m_baseModel );
+        std::string      baseValue = baseModel->m_params[ii].value;
+
+        if( param.value == baseValue )
+            continue;
+
+        // One more check for equivalence, mostly for early 7.0 files which wrote all parameters
+        // to the Sim.Params field in normalized format
+        if( param.value == SIM_VALUE::Normalize( SIM_VALUE::ToDouble( baseValue ) ) )
+            continue;
+
+        // Overrides must be written
+        return true;
     }
 
     return false;
diff --git a/eeschema/sim/sim_model_ngspice.cpp b/eeschema/sim/sim_model_ngspice.cpp
index 6d29232ee1..663bac8a7f 100644
--- a/eeschema/sim/sim_model_ngspice.cpp
+++ b/eeschema/sim/sim_model_ngspice.cpp
@@ -215,43 +215,6 @@ bool SIM_MODEL_NGSPICE::canSilentlyIgnoreParam( const std::string& aParamName )
 }
 
 
-bool SIM_MODEL_NGSPICE::requiresSpiceModelLine( const SPICE_ITEM& aItem ) const
-{
-    // Model must be written if there's no base model or the base model is an internal model
-    if( !m_baseModel || aItem.baseModelName == "" )
-        return true;
-
-    for( int ii = 0; ii < GetParamCount(); ++ii )
-    {
-        const PARAM& param = m_params[ii];
-
-        // Instance parameters are written in item lines
-        if( param.info.isSpiceInstanceParam )
-            continue;
-
-        // Empty parameters are interpreted as default-value
-        if ( param.value == "" )
-            continue;
-
-        const SIM_MODEL_NGSPICE* baseModel = dynamic_cast<const SIM_MODEL_NGSPICE*>( m_baseModel );
-        std::string              baseValue = baseModel->m_params[ii].value;
-
-        if( param.value == baseValue )
-            continue;
-
-        // One more check for equivalence, mostly for early 7.0 files which wrote all parameters
-        // to the Sim.Params field in normalized format
-        if( param.value == SIM_VALUE::Normalize( SIM_VALUE::ToDouble( baseValue ) ) )
-            continue;
-
-        // Overrides must be written
-        return true;
-    }
-
-    return false;
-}
-
-
 std::vector<std::string> SIM_MODEL_NGSPICE::GetPinNames() const
 {
     return ModelInfo( getModelType() ).pinNames;
diff --git a/eeschema/sim/sim_model_ngspice.h b/eeschema/sim/sim_model_ngspice.h
index deb39f10df..0683580c8c 100644
--- a/eeschema/sim/sim_model_ngspice.h
+++ b/eeschema/sim/sim_model_ngspice.h
@@ -109,8 +109,6 @@ protected:
     int doFindParam( const std::string& aParamName ) const override;
 
 private:
-    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override;
-
     bool canSilentlyIgnoreParam( const std::string& aParamName );
 
     MODEL_TYPE getModelType() const;
diff --git a/eeschema/sim/sim_model_subckt.h b/eeschema/sim/sim_model_subckt.h
index e0d8515144..b38c2d217a 100644
--- a/eeschema/sim/sim_model_subckt.h
+++ b/eeschema/sim/sim_model_subckt.h
@@ -60,8 +60,6 @@ public:
     std::string GetSpiceCode() const;
 
 private:
-    bool requiresSpiceModelLine( const SPICE_ITEM& aItem ) const override { return true; }
-
     std::vector<std::unique_ptr<PARAM::INFO>> m_paramInfos;
 };
 
diff --git a/eeschema/sim/spice_generator.cpp b/eeschema/sim/spice_generator.cpp
index 3add2bed00..54d36be732 100644
--- a/eeschema/sim/spice_generator.cpp
+++ b/eeschema/sim/spice_generator.cpp
@@ -34,8 +34,7 @@ std::string SPICE_GENERATOR::ModelName( const SPICE_ITEM& aItem ) const
     if( aItem.baseModelName == "" )
         return fmt::format( "__{}", aItem.refName );
 
-    // FIXME: This ModelLine() call is relatively expensive.
-    if( ModelLine( aItem ) != "" )
+    if( m_model.requiresSpiceModelLine( aItem ) )
         return fmt::format( "{}.{}", aItem.refName, aItem.baseModelName );
 
     return aItem.baseModelName;