diff --git a/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/AbstractKieProject.java b/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/AbstractKieProject.java
index 7775abacc43..6ae861d93b5 100644
--- a/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/AbstractKieProject.java
+++ b/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/AbstractKieProject.java
@@ -32,6 +32,7 @@
 import org.drools.compiler.kproject.models.KieBaseModelImpl;
 import org.drools.compiler.kproject.models.KieModuleModelImpl;
 import org.drools.compiler.kproject.models.KieSessionModelImpl;
+import org.drools.io.InternalResource;
 import org.drools.util.StringUtils;
 import org.kie.api.builder.Message;
 import org.kie.api.builder.model.KieBaseModel;
@@ -65,6 +66,8 @@ public abstract class AbstractKieProject implements KieProject {
 
     private final Map<String, KieSessionModel>   kSessionModels             = new HashMap<>();
 
+    private Map<InternalResource, String>        packageNameCache           = new HashMap<>();
+
     private static final Predicate<String> BUILD_ALL = s -> true;
 
     public ResultsImpl verify() {
@@ -83,6 +86,7 @@ public void verify(BuildContext buildContext) {
         for ( KieBaseModel model : kBaseModels.values() ) {
             buildKnowledgePackages((KieBaseModelImpl) model, buildContext);
         }
+        packageNameCache.clear();
     }
 
     private void verify(String[] kBaseNames, BuildContext buildContext) {
@@ -93,6 +97,7 @@ private void verify(String[] kBaseNames, BuildContext buildContext) {
             }
             buildKnowledgePackages( kieBaseModel, buildContext );
         }
+        packageNameCache.clear();
     }
 
     public KieBaseModel getDefaultKieBaseModel() {
@@ -331,7 +336,7 @@ private void addFiles( Predicate<String> buildFilter, Set<Asset> assets, KieBase
                            InternalKieModule kieModule, boolean useFolders) {
         for (String fileName : kieModule.getFileNames()) {
             if (buildFilter.test( fileName ) && !fileName.startsWith(".") && !fileName.endsWith(".properties") &&
-                    filterFileInKBase(kieModule, kieBaseModel, fileName, () -> kieModule.getResource( fileName ), useFolders)) {
+                    filterFileInKBase(kieModule, kieBaseModel, fileName, () -> kieModule.getResource( fileName ), useFolders, packageNameCache)) {
                 assets.add(new Asset( kieModule, fileName ));
             }
         }
diff --git a/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/KieBuilderImpl.java b/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/KieBuilderImpl.java
index ec1cb65533d..7245269a74b 100644
--- a/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/KieBuilderImpl.java
+++ b/drools-compiler/src/main/java/org/drools/compiler/kie/builder/impl/KieBuilderImpl.java
@@ -23,8 +23,10 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
+import java.util.Map;
 import java.util.function.BiFunction;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
@@ -363,7 +365,11 @@ private static ResourceType getResourceType( ResourceConfiguration conf ) {
     }
 
     public static boolean filterFileInKBase( InternalKieModule kieModule, KieBaseModel kieBase, String fileName, Supplier<InternalResource> file, boolean useFolders ) {
-        return isFileInKieBase( kieBase, fileName, file, useFolders ) &&
+        return filterFileInKBase(kieModule, kieBase, fileName, file, useFolders, null);
+    }
+
+    public static boolean filterFileInKBase( InternalKieModule kieModule, KieBaseModel kieBase, String fileName, Supplier<InternalResource> file, boolean useFolders, Map<InternalResource, String> packageNameCache) {
+        return isFileInKieBase( kieBase, fileName, file, useFolders, packageNameCache ) &&
                 ( isKieExtension( fileName ) || getResourceType( kieModule, fileName ) != null );
     }
 
@@ -371,7 +377,7 @@ private static boolean isKieExtension(String fileName) {
         return !isJavaSourceFile( fileName ) && ResourceType.determineResourceType(fileName) != null;
     }
 
-    private static boolean isFileInKieBase( KieBaseModel kieBase, String fileName, Supplier<InternalResource> file, boolean useFolders ) {
+    private static boolean isFileInKieBase( KieBaseModel kieBase, String fileName, Supplier<InternalResource> file, boolean useFolders, Map<InternalResource, String> packageNameCache ) {
         int lastSep = fileName.lastIndexOf( "/" );
         if ( lastSep + 1 < fileName.length() && fileName.charAt( lastSep + 1 ) == '.' ) {
             // skip dot files
@@ -381,15 +387,15 @@ private static boolean isFileInKieBase( KieBaseModel kieBase, String fileName, S
             return true;
         } else {
             String folderNameForFile = lastSep > 0 ? fileName.substring( 0, lastSep ) : "";
-            String pkgNameForFile = packageNameForFile( fileName, folderNameForFile, !useFolders, file );
+            String pkgNameForFile = packageNameForFile( fileName, folderNameForFile, !useFolders, file, packageNameCache );
             return isPackageInKieBase( kieBase, pkgNameForFile );
         }
     }
 
-    private static String packageNameForFile( String fileName, String folderNameForFile, boolean discoverPackage, Supplier<InternalResource> file ) {
+    private static String packageNameForFile( String fileName, String folderNameForFile, boolean discoverPackage, Supplier<InternalResource> file, Map<InternalResource, String> packageNameCache ) {
         String packageNameFromFolder = getRelativePackageName(folderNameForFile.replace( '/', '.' ));
         if (discoverPackage) {
-            String packageNameForFile = packageNameFromAsset(fileName, file.get());
+            String packageNameForFile = packageNameFromAsset(fileName, file.get(), packageNameCache);
             if (packageNameForFile != null) {
                 packageNameForFile = getRelativePackageName( packageNameForFile );
                 if ( !packageNameForFile.equals( packageNameFromFolder ) ) {
@@ -403,10 +409,18 @@ private static String packageNameForFile( String fileName, String folderNameForF
         return packageNameFromFolder;
     }
 
-    private static String packageNameFromAsset(String fileName, InternalResource file) {
+    private static String packageNameFromAsset(String fileName, InternalResource file, Map<InternalResource, String> packageNameCache) {
         if (file == null) {
             return null;
         }
+        if (packageNameCache != null) {
+            return packageNameCache.computeIfAbsent(file, f -> packageNameFromAsset(fileName, f));
+        } else {
+            return packageNameFromAsset(fileName, file);
+        }
+    }
+
+    private static String packageNameFromAsset(String fileName, InternalResource file) {
         if (fileName.endsWith( ".drl" )) {
             return packageNameFromDrl( new String(file.getBytes()) );
         }