diff --git a/src/main/groovy/com/lesfurets/jenkins/unit/BasePipelineTest.groovy b/src/main/groovy/com/lesfurets/jenkins/unit/BasePipelineTest.groovy
index f6555a92..cae8f334 100644
--- a/src/main/groovy/com/lesfurets/jenkins/unit/BasePipelineTest.groovy
+++ b/src/main/groovy/com/lesfurets/jenkins/unit/BasePipelineTest.groovy
@@ -1,5 +1,7 @@
 package com.lesfurets.jenkins.unit
 
+import com.lesfurets.jenkins.unit.global.lib.LibraryLoader
+
 import static java.util.stream.Collectors.joining
 import static org.assertj.core.api.Assertions.assertThat
 
diff --git a/src/main/groovy/com/lesfurets/jenkins/unit/PipelineTestHelper.groovy b/src/main/groovy/com/lesfurets/jenkins/unit/PipelineTestHelper.groovy
index e9a71112..a8362b05 100644
--- a/src/main/groovy/com/lesfurets/jenkins/unit/PipelineTestHelper.groovy
+++ b/src/main/groovy/com/lesfurets/jenkins/unit/PipelineTestHelper.groovy
@@ -238,6 +238,10 @@ class PipelineTestHelper {
 
     Map<String, String> mockReadFileOutputs = [:]
 
+    private static final Map<String, Class> scriptClasses = [:]
+
+    private boolean shouldCacheScriptsAndLibraries = false
+
     /**
     * Get library loader object
     *
@@ -248,6 +252,18 @@ class PipelineTestHelper {
         return this.libLoader
     }
 
+    PipelineTestHelper withShouldCacheScriptsAndLibraries(boolean shouldCacheScriptsAndLibraries) {
+        this.shouldCacheScriptsAndLibraries = shouldCacheScriptsAndLibraries
+        return this
+    }
+
+    /**
+     * Clears the cache of loaded script classes
+     */
+    static void clearScriptClasses() {
+        scriptClasses.clear()
+    }
+
     /**
      * Method interceptor for method 'load' to load scripts via encapsulated GroovyScriptEngine
      */
@@ -431,6 +447,11 @@ class PipelineTestHelper {
         LibraryAnnotationTransformer libraryTransformer = new LibraryAnnotationTransformer(libLoader)
         configuration.addCompilationCustomizers(libraryTransformer)
 
+        if (!shouldCacheScriptsAndLibraries) {
+            clearScriptClasses()
+            LibraryLoader.clearLibRecords()
+        }
+
         ImportCustomizer importCustomizer = new ImportCustomizer()
         imports.each { k, v -> importCustomizer.addImport(k, v) }
         configuration.addCompilationCustomizers(importCustomizer)
@@ -541,7 +562,11 @@ class PipelineTestHelper {
     Script loadScript(String scriptName, Binding binding) {
         Objects.requireNonNull(binding, "Binding cannot be null.")
         Objects.requireNonNull(gse, "GroovyScriptEngine is not initialized: Initialize the helper by calling init().")
-        Class scriptClass = gse.loadScriptByName(scriptName)
+        Class scriptClass = scriptClasses.get(scriptName)
+        if (scriptClass == null) {
+            scriptClass = gse.loadScriptByName(scriptName)
+            scriptClasses.put(scriptName, scriptClass)
+        }
         setGlobalVars(binding)
         Script script = InvokerHelper.createScript(scriptClass, binding)
         InterceptingGCL.interceptClassMethods(script.metaClass, this, binding)
diff --git a/src/main/groovy/com/lesfurets/jenkins/unit/global/lib/LibraryLoader.groovy b/src/main/groovy/com/lesfurets/jenkins/unit/global/lib/LibraryLoader.groovy
index 7df7d718..bb037b27 100644
--- a/src/main/groovy/com/lesfurets/jenkins/unit/global/lib/LibraryLoader.groovy
+++ b/src/main/groovy/com/lesfurets/jenkins/unit/global/lib/LibraryLoader.groovy
@@ -35,7 +35,7 @@ class LibraryLoader {
     //classes want to access the binding env.
     Boolean preloadLibraryClasses = true
 
-    final Map<String, LibraryRecord> libRecords = new HashMap<>()
+    static final Map<String, LibraryRecord> libRecords = new HashMap<>()
 
     LibraryLoader(GroovyClassLoader groovyClassLoader, Map<String, LibraryConfiguration> libraryDescriptions) {
         this.groovyClassLoader = groovyClassLoader
@@ -66,6 +66,13 @@ class LibraryLoader {
         }
     }
 
+    /**
+     * Clears the cache of lib records
+     */
+    static void clearLibRecords() {
+        libRecords.clear()
+    }
+
     /**
      * Load library described by expression if it corresponds to a known library configuration
      * @param expression
diff --git a/src/test/groovy/com/lesfurets/jenkins/TestLibraryAndScriptCaching.groovy b/src/test/groovy/com/lesfurets/jenkins/TestLibraryAndScriptCaching.groovy
new file mode 100644
index 00000000..1b7cf538
--- /dev/null
+++ b/src/test/groovy/com/lesfurets/jenkins/TestLibraryAndScriptCaching.groovy
@@ -0,0 +1,71 @@
+package com.lesfurets.jenkins
+
+import com.lesfurets.jenkins.unit.BasePipelineTest
+import com.lesfurets.jenkins.unit.global.lib.LibraryLoader
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+import static com.lesfurets.jenkins.unit.global.lib.LibraryConfiguration.library
+import static com.lesfurets.jenkins.unit.global.lib.ProjectSource.projectSource
+import static org.junit.jupiter.api.Assertions.assertEquals
+import static org.junit.jupiter.api.Assertions.assertNotEquals
+
+class TestLibraryAndScriptCaching extends BasePipelineTest {
+
+    @Override
+    @BeforeEach
+    void setUp() throws Exception {
+        scriptRoots += 'src/test/jenkins'
+        super.setUp()
+    }
+
+    private final library = library().name('commons')
+            .defaultVersion('<notNeeded>')
+            .allowOverride(false)
+            .implicit(false)
+            .targetPath('<notNeeded>')
+            .retriever(projectSource(this.class.getResource('/libs/commons@master').getFile()))
+            .build()
+
+    @Test
+    void scriptCacheDisabled() {
+        def script1 = loadScript('job/exampleJob.jenkins')
+        helper.init()
+        def script2 = loadScript('job/exampleJob.jenkins')
+        assertNotEquals(script1.metaClass.theClass, script2.metaClass.theClass)
+    }
+
+    @Test
+    void scriptCacheEnabledDisabled() {
+        helper.withShouldCacheScriptsAndLibraries(true)
+        def script1 = loadScript('job/exampleJob.jenkins')
+        helper.init()
+        def script2 = loadScript('job/exampleJob.jenkins')
+        assertEquals(script1.metaClass.theClass, script2.metaClass.theClass)
+    }
+
+    @Test
+    void libraryCacheDisabled() {
+        helper.registerSharedLibrary(library)
+        helper.libLoader.loadLibrary(library.name)
+        def lib1 = LibraryLoader.libRecords.get("commons@<notNeeded>")
+        helper.init()
+        helper.registerSharedLibrary(library)
+        helper.libLoader.loadLibrary(library.name)
+        def lib2 = LibraryLoader.libRecords.get("commons@<notNeeded>")
+        assertNotEquals(lib1, lib2)
+    }
+
+    @Test
+    void libraryCacheEnabled() {
+        helper.withShouldCacheScriptsAndLibraries(true)
+        helper.registerSharedLibrary(library)
+        helper.libLoader.loadLibrary(library.name)
+        def lib1 = LibraryLoader.libRecords.get("commons@<notNeeded>")
+        helper.init()
+        helper.registerSharedLibrary(library)
+        helper.libLoader.loadLibrary(library.name)
+        def lib2 = LibraryLoader.libRecords.get("commons@<notNeeded>")
+        assertEquals(lib1, lib2)
+    }
+}