diff --git a/functions/functions.php b/functions/functions.php
index 3e33238..88c9976 100644
--- a/functions/functions.php
+++ b/functions/functions.php
@@ -27,15 +27,20 @@ require_once __DIR__ . '/../vendor/autoload.php';
  */
 function mdCsvxmlAutoloader(string $className):void {
 
-    $classDirs = AUTOLOAD_DIRS;
+    // Try using class map as defined through /scripts/buildClassMap.php
 
-    foreach ($classDirs as $classDir) {
+    if (isset(AUTOLOAD_CLASS_MAP[$className])) {
+        include AUTOLOAD_CLASS_MAP[$className];
+        return;
+    }
 
+    // Fallback: Load classes by autoload directories
+
+    foreach (AUTOLOAD_DIRS as $classDir) {
         if (\file_exists("$classDir/$className.php")) {
             include "$classDir/$className.php";
             return;
         }
-
     }
 
 }
@@ -309,7 +314,8 @@ function rrmdir(string $dir):void {
         $objects = scandir($dir);
         foreach ($objects as $object) {
             if ($object != "." && $object != "..") {
-                if (filetype($dir . "/" . $object) == "dir") rrmdir($dir . "/" . $object); else unlink($dir . "/" . $object);
+                if (filetype($dir . "/" . $object) == "dir") rrmdir($dir . "/" . $object);
+                else unlink($dir . "/" . $object);
             }
         }
         reset($objects);
diff --git a/inc/constants.php b/inc/constants.php
index 301718f..53a2b9f 100644
--- a/inc/constants.php
+++ b/inc/constants.php
@@ -30,3 +30,69 @@ const AUTOLOAD_DIRS = [
     __DIR__ . "/../classes/MDErrorReporter/exceptions/updates",
     __DIR__ . "/../classes/MDTlLoader/exceptions",
 ];
+
+const AUTOLOAD_CLASS_MAP = [
+    'CsvxmlAvailableFields' => __DIR__ . '/../classes/CsvxmlAvailableFields.php',
+    'MDTlLoader' => __DIR__ . '/../classes/MDTlLoader/src/MDTlLoader.php',
+    'MD_JAIL' => __DIR__ . '/../classes/MD_STD/MD_JAIL.php',
+    'MD_STD' => __DIR__ . '/../classes/MD_STD/MD_STD.php',
+    'MD_STD_CACHE' => __DIR__ . '/../classes/MD_STD/MD_STD_CACHE.php',
+    'MD_STD_IN' => __DIR__ . '/../classes/MD_STD/MD_STD_IN.php',
+    'MD_STD_SEC' => __DIR__ . '/../classes/MD_STD/MD_STD_SEC.php',
+    'MDAppointmentRecordingSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDAppointmentRecordingSet.php',
+    'MDConservationReportTypeSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDConservationReportTypeSet.php',
+    'MDCurrenciesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDCurrenciesSet.php',
+    'MDEntryTypesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDEntryTypesSet.php',
+    'MDEventsSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDEventsSet.php',
+    'MDLanguagesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDLanguagesSet.php',
+    'MDLicensesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDLicensesSet.php',
+    'MDMarkingTypesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDMarkingTypesSet.php',
+    'MDObjectPositionsSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDObjectPositionsSet.php',
+    'MDObjectPublicationBackgrounds' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDObjectPublicationBackgrounds.php',
+    'MDPlacetypesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDPlacetypesSet.php',
+    'MDPodcastContributorsSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDPodcastContributorsSet.php',
+    'MDSourceTypeSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDSourceTypeSet.php',
+    'MDTitleTypesSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDTitleTypesSet.php',
+    'MDUnitsSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDUnitsSet.php',
+    'MDValueSet' => __DIR__ . '/../classes/MDAllowedValueSets/src/MDValueSet.php',
+    'MDErrorReporter' => __DIR__ . '/../classes/MDErrorReporter/MDErrorReporter.php',
+    'MDMailFormat' => __DIR__ . '/../classes/MDMailer/src/MDMailFormat.php',
+    'MDMailerHelper' => __DIR__ . '/../classes/MDMailer/src/MDMailerHelper.php',
+    'MD_CONF_EMAIL' => __DIR__ . '/../conf/MD_CONF_EMAIL.php',
+    'MDAccessDeniedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDAccessDeniedException.php',
+    'MDConfigCannotBeLoadedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDConfigCannotBeLoadedException.php',
+    'MDExpectedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDExpectedException.php',
+    'MDFileDoesNotExist' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDFileDoesNotExist.php',
+    'MDFileIsNotReadable' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDFileIsNotReadable.php',
+    'MDInaccessiblePropertyException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDInaccessiblePropertyException.php',
+    'MDInvalidColorCode' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDInvalidColorCode.php',
+    'MDInvalidEmail' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDInvalidEmail.php',
+    'MDInvalidUrl' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDInvalidUrl.php',
+    'MDOutputBufferNotStarted' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDOutputBufferNotStarted.php',
+    'MDRequiredConfigNotSet' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDRequiredConfigNotSet.php',
+    'MDWrongCsrfTokenException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDWrongCsrfTokenException.php',
+    'MDgenericInvalidInputsException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDgenericInvalidInputsException.php',
+    'MDhttpFailedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDhttpFailedException.php',
+    'MDmainEntityNotExistentException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDmainEntityNotExistentException.php',
+    'MDpageParameterNotFromListException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/generic/MDpageParameterNotFromListException.php',
+    'MDPageNotInAggregatedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/page/MDPageNotInAggregatedException.php',
+    'MDmainEntityNotPublicException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/page/MDmainEntityNotPublicException.php',
+    'MDpageParameterMissingException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/page/MDpageParameterMissingException.php',
+    'MDpageParameterNotNumericException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/page/MDpageParameterNotNumericException.php',
+    'MDDuplicateLinkException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDDuplicateLinkException.php',
+    'MDFileUploadNotAcceptedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDFileUploadNotAcceptedException.php',
+    'MDInvalidCurrency' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidCurrency.php',
+    'MDInvalidInputDate' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidInputDate.php',
+    'MDInvalidLengthUnit' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidLengthUnit.php',
+    'MDInvalidLicense' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidLicense.php',
+    'MDInvalidObjectPublicationBackground' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidObjectPublicationBackground.php',
+    'MDInvalidWeightUnit' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDInvalidWeightUnit.php',
+    'MDNoUpdateVarSetException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDNoUpdateVarSetException.php',
+    'MDTooManyFilesUploadException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDTooManyFilesUploadException.php',
+    'MDWrongFileType' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDWrongFileType.php',
+    'MDcouldNotSaveException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDcouldNotSaveException.php',
+    'MDcouldNotSetPublic' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDcouldNotSetPublic.php',
+    'MDwriteAccessDeniedException' => __DIR__ . '/../classes/MDErrorReporter/exceptions/updates/MDwriteAccessDeniedException.php',
+    'MDMissingFileException' => __DIR__ . '/../classes/MDTlLoader/exceptions/MDMissingFileException.php',
+    'MDMissingTranslationException' => __DIR__ . '/../classes/MDTlLoader/exceptions/MDMissingTranslationException.php',
+];
diff --git a/scripts/buildClassMap.php b/scripts/buildClassMap.php
new file mode 100644
index 0000000..6f4aa17
--- /dev/null
+++ b/scripts/buildClassMap.php
@@ -0,0 +1,39 @@
+<?PHP
+/**
+ * Generates a class map, based on a constant AUTOLOAD_DIRS.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+require_once __DIR__ . '/../inc/constants.php';
+
+$classesToAutoload = [];
+
+// Load list of classes
+
+foreach (AUTOLOAD_DIRS as $dir) {
+
+    $dir = str_replace(realpath(__DIR__ . "/../") . "/inc/../", "", $dir);
+    foreach (glob($dir . "/*.php") as $file) {
+        $classesToAutoload[pathinfo(__DIR__ . '/../' . $file, PATHINFO_FILENAME)] = $file;
+    }
+
+}
+
+// Output
+
+$output = [];
+
+foreach ($classesToAutoload as $key => $value) {
+
+    $output[] = '    \'' . $key . '\' => __DIR__ . \'/../' . $value . '\',';
+
+}
+
+$toWrite = '<?PHP
+const AUTOLOAD_CLASS_MAP = [
+' . implode(PHP_EOL, $output) . '
+];';
+
+file_put_contents("tmp-class-map.php", $toWrite);