diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@
 project(Dolphin VERSION ${RELEASE_SERVICE_VERSION})
 
 set(QT_MIN_VERSION "5.11.0")
-set(KF5_MIN_VERSION "5.69.0")
+set(KF5_MIN_VERSION "5.70.0")
 
 # ECM setup
 find_package(ECM ${KF5_MIN_VERSION} CONFIG REQUIRED)
diff --git a/src/views/dolphinview.cpp b/src/views/dolphinview.cpp
--- a/src/views/dolphinview.cpp
+++ b/src/views/dolphinview.cpp
@@ -1493,13 +1493,27 @@
                                      KIO::filesize_t& totalFileSize) const
 {
     const int itemCount = m_model->count();
+
+    bool countFileSize = true;
+
+    // In case we have a precomputed value
+    const auto job = KIO::stat(m_model->rootItem().url());
+    job->exec();
+    const auto entry =  job->statResult();
+    if (entry.contains(KIO::UDSEntry::UDS_RECURSIVE_SIZE)) {
+        totalFileSize = static_cast<KIO::filesize_t>(entry.numberValue(KIO::UDSEntry::UDS_RECURSIVE_SIZE));
+        countFileSize = false;
+    }
+
     for (int i = 0; i < itemCount; ++i) {
         const KFileItem item = m_model->fileItem(i);
         if (item.isDir()) {
             ++folderCount;
         } else {
             ++fileCount;
-            totalFileSize += item.size();
+            if (countFileSize) {
+                totalFileSize += item.size();
+            }
         }
     }
 }