diff --git a/effects/glide/glide.cpp b/effects/glide/glide.cpp
--- a/effects/glide/glide.cpp
+++ b/effects/glide/glide.cpp
@@ -294,6 +294,16 @@
 
 bool GlideEffect::isGlideWindow(EffectWindow *w) const
 {
+    // We don't want to animate most of plasmashell's windows, yet, some
+    // of them we want to, for example, Task Manager Settings window.
+    // The problem is that all those window share single window class.
+    // So, the only way to decide whether a window should be animated is
+    // to use a heuristic: if a window has decoration, then it's most
+    // likely a dialog or a settings window so we have to animate it.
+    if (w->windowClass() == QLatin1String("plasmashell plasmashell")) {
+        return w->hasDecoration();
+    }
+
     if (s_blacklist.contains(w->windowClass())) {
         return false;
     }