diff --git a/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java b/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
index d7d7424..c4af623 100644
--- a/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
+++ b/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
@@ -53,8 +53,13 @@ public class PublicationsRetrieverPlugin {
         ConnSupportUtils.shouldBlockMost5XXDomains = false;
         LoaderAndChecker.setCouldRetryRegex();
 
-        PublicationsRetriever.threadsMultiplier = 10;
-        int workerThreadsCount = (Runtime.getRuntime().availableProcessors() * PublicationsRetriever.threadsMultiplier);
+        int availableProcessors = Runtime.getRuntime().availableProcessors();
+        if ( availableProcessors <= 4 )
+            PublicationsRetriever.threadsMultiplier = 10;
+        else
+            PublicationsRetriever.threadsMultiplier = 6;
+
+        int workerThreadsCount = (availableProcessors * PublicationsRetriever.threadsMultiplier);
         logger.info("Use " + workerThreadsCount + " worker-threads.");
         PublicationsRetriever.executor = Executors.newFixedThreadPool(workerThreadsCount);
     }