speed up a little bit apidocs generation
diff --git a/Jenkinsfile b/Jenkinsfile
index 32671d7..669a459 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -58,7 +58,7 @@
                 writeFile file: 'target/classes/apidocs.txt', text: 'file created in order to allow aggregated javadoc generation, target/classes is needed for all modules'
                 writeFile file: 'jspwiki-it-tests/target/classes/apidocs.txt', text: 'file created in order to allow aggregated javadoc generation, target/classes is needed for all modules'
                 withEnv( [ "Path+JDK=$JAVA_JDK_11/bin", "Path+MAVEN=$MAVEN_3_LATEST/bin", "JAVA_HOME=$JAVA_JDK_11" ] ) {
-                    sh 'mvn package javadoc:aggregate-no-fork -DskipTests -pl !jspwiki-portable -Djdk.javadoc.doclet.version=2.0.15'
+                    sh 'mvn package javadoc:aggregate-no-fork -DskipTests -pl !jspwiki-portable -Djdk.javadoc.doclet.version=2.0.15 -T 1C'
                     sh 'java -cp jspwiki-main/target/classes org.apache.wiki.TranslationsCheck site'
                 }
             }