diff --git a/systemmonitor/ksystemactivitydialog.h b/systemmonitor/ksystemactivitydialog.h
--- a/systemmonitor/ksystemactivitydialog.h
+++ b/systemmonitor/ksystemactivitydialog.h
@@ -47,16 +47,15 @@
         void setFilterText(const QString &filterText);
         QString filterText() const;
 
+        QSize sizeHint() const override;
+
         /** Save the settings if the user presses the ESC key */
         void reject() override;
 
     protected:
         /** Save the settings if the user clicks (x) button on the window */
         void closeEvent(QCloseEvent *event) override;
 
-    private slots:
-        void slotInit();
-
     private:
         void saveDialogSettings();
 
diff --git a/systemmonitor/ksystemactivitydialog.cpp b/systemmonitor/ksystemactivitydialog.cpp
--- a/systemmonitor/ksystemactivitydialog.cpp
+++ b/systemmonitor/ksystemactivitydialog.cpp
@@ -21,23 +21,15 @@
 #include "ksystemactivitydialog.h"
 
 #include <QCloseEvent>
-#include <QLayout>
 #include <QString>
 #include <QAction>
-#include <QTreeView>
 #include <QIcon>
-#include <QWindow>
-#include <QDialog>
 #include <QDBusConnection>
-#include <QPushButton>
 #include <QVBoxLayout>
 #include <QLineEdit>
-#include <QScreen>
-#include <QTimer>
 
 #include <KSharedConfig>
 #include <KConfigGroup>
-#include <KWindowConfig>
 #include <KWindowSystem>
 #include <KLocalizedString>
 #include <QDebug>
@@ -51,43 +43,20 @@
     mainLayout->addWidget(&m_processList);
     m_processList.setScriptingEnabled(true);
     setSizeGripEnabled(true);
-    (void)minimumSizeHint(); //Force the dialog to be laid out now
+
     layout()->setContentsMargins(0,0,0,0);
 
     // Since we kinda act like an application more than just a Window, map the usual ctrl+Q shortcut to close as well
     QAction *closeWindow = new QAction(this);
     closeWindow->setShortcut(QKeySequence::Quit);
     connect(closeWindow, &QAction::triggered, this, &KSystemActivityDialog::accept);
     addAction(closeWindow);
 
-    // We need the resizing to be done once the dialog has been initialized
-    // otherwise we don't actually have a window.
-    QTimer::singleShot(0, this, &KSystemActivityDialog::slotInit);
-}
-
-void KSystemActivityDialog::slotInit()
-{
-    resize(QSize(650, 420));
-
     KConfigGroup cg = KSharedConfig::openConfig()->group("TaskDialog");
-    KWindowConfig::restoreWindowSize(windowHandle(), cg);
-
     m_processList.loadSettings(cg);
-    // Since we default to forcing the window to be KeepAbove, if the user turns this off, remember this
-    const bool keepAbove = true; // KRunnerSettings::keepTaskDialogAbove();
-    if (keepAbove) {
-        KWindowSystem::setState(winId(), NET::KeepAbove);
-    }
 
     QDBusConnection con = QDBusConnection::sessionBus();
     con.registerObject(QStringLiteral("/"), this, QDBusConnection::ExportAllSlots);
-
-    QRect geom = windowHandle()->screen()->geometry();
-    QSize ourSize = windowHandle()->size();
-
-    int w = ourSize.width();
-    int h = ourSize.height();
-    setGeometry((geom.width() - w)/2, (geom.height() - h)/2, w, h);
 }
 
 void KSystemActivityDialog::run()
@@ -115,26 +84,23 @@
     event->accept();
 }
 
-
-void KSystemActivityDialog::reject ()
+void KSystemActivityDialog::reject()
 {
     saveDialogSettings();
     QDialog::reject();
 }
 
 void KSystemActivityDialog::saveDialogSettings()
 {
-    //When the user closes the dialog, save the position and the KeepAbove state
+    // When the user closes the dialog, save the process list setup
     KConfigGroup cg = KSharedConfig::openConfig()->group("TaskDialog");
-    KWindowConfig::saveWindowSize(windowHandle(), cg);
     m_processList.saveSettings(cg);
-
-    // Since we default to forcing the window to be KeepAbove, if the user turns this off, remember this
-    // vHanda: Temporarily commented out
-    // bool keepAbove = KWindowSystem::windowInfo(winId(), NET::WMState).hasState(NET::KeepAbove);
-    // KRunnerSettings::setKeepTaskDialogAbove(keepAbove);
     KSharedConfig::openConfig()->sync();
 }
 
-#endif // not Q_WS_WIN
+QSize KSystemActivityDialog::sizeHint() const
+{
+    return QSize(650, 420);
+}
 
+#endif // not Q_WS_WIN