diff --git a/src/icon.cpp b/src/icon.cpp
--- a/src/icon.cpp
+++ b/src/icon.cpp
@@ -439,6 +439,7 @@
     QString iconSource = m_source.toString();
 
     if (iconSource.startsWith(QLatin1String("image://"))) {
+        const auto multiplier = QCoreApplication::instance()->testAttribute(Qt::AA_UseHighDpiPixmaps) ? (window() ? window()->devicePixelRatio() : qGuiApp->devicePixelRatio()) : 1;
         QUrl iconUrl(iconSource);
         QString iconProviderId = iconUrl.host();
         QString iconId = iconUrl.path();
@@ -455,10 +456,10 @@
             return img;
         switch(imageProvider->imageType()){
         case QQmlImageProviderBase::Image:
-            img = imageProvider->requestImage(iconId, &actualSize, size);
+            img = imageProvider->requestImage(iconId, &actualSize, size * multiplier);
             break;
         case QQmlImageProviderBase::Pixmap:
-            img = imageProvider->requestPixmap(iconId, &actualSize, size).toImage();
+            img = imageProvider->requestPixmap(iconId, &actualSize, size * multiplier).toImage();
             break;
         case QQmlImageProviderBase::Texture:
         case QQmlImageProviderBase::Invalid:
diff --git a/src/libkirigami/platformtheme.cpp b/src/libkirigami/platformtheme.cpp
--- a/src/libkirigami/platformtheme.cpp
+++ b/src/libkirigami/platformtheme.cpp
@@ -129,6 +129,7 @@
 
 void PlatformThemePrivate::syncCustomPalette()
 {
+    const auto prev = customPalette;
     for (auto state : { QPalette::Active, QPalette::Inactive, QPalette::Disabled }) {
         setPaletteColor(customPalette, state, QPalette::WindowText, q->textColor());
         setPaletteColor(customPalette, state, QPalette::Window, q->backgroundColor());
@@ -143,7 +144,9 @@
         setPaletteColor(customPalette, state, QPalette::Link, q->linkColor());
         setPaletteColor(customPalette, state, QPalette::LinkVisited, q->visitedLinkColor());
     }
-    emit q->paletteChanged(customPalette);
+    if (prev != customPalette) {
+        emit q->paletteChanged(customPalette);
+    }
 }
 
 void PlatformThemePrivate::findParentStyle()