diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -151,6 +151,7 @@
  KF5::I18n
  KF5::Crash
  KF5::DBusAddons            # KDEInitInterface
+ KF5::Solid
 )
 
 if (UNIX)
diff --git a/src/core/kfileitem.cpp b/src/core/kfileitem.cpp
--- a/src/core/kfileitem.cpp
+++ b/src/core/kfileitem.cpp
@@ -41,7 +41,9 @@
 #include <knfsshare.h>
 #include <ksambashare.h>
 #endif
-#include <kfilesystemtype.h>
+#include <Solid/Device>
+#include <Solid/NetworkShare>
+#include <Solid/StorageAccess>
 
 class KFileItemPrivate : public QSharedData
 {
@@ -758,13 +760,17 @@
 {
     if (m_slow == SlowUnknown) {
         const QString path = localPath();
-        if (!path.isEmpty()) {
-            const KFileSystemType::Type fsType = KFileSystemType::fileSystemType(path);
-            m_slow = (fsType == KFileSystemType::Nfs || fsType == KFileSystemType::Smb) ? Slow : Fast;
-        } else {
-            m_slow = Slow;
+        const QList<Solid::Device> devices = Solid::Device::listFromType(Solid::DeviceInterface::NetworkShare);
+        for (Solid::Device device : devices) {
+            const Solid::StorageAccess *storageAccess = device.as<Solid::StorageAccess>();
+            if (path.startsWith(storageAccess->filePath())) {
+                m_slow = Slow;
+                return true;
+            }
         }
+        m_slow = Fast;
     }
+
     return m_slow == Slow;
 }