diff --git a/core/document.cpp b/core/document.cpp
--- a/core/document.cpp
+++ b/core/document.cpp
@@ -1309,7 +1309,7 @@
             delete r;
         }
         // If the requested area is above 8000000 pixels, switch on the tile manager
-        else if ( !tilesManager && m_generator->hasFeature( Generator::TiledRendering ) && (long)r->width() * (long)r->height() > 8000000L )
+        else if ( !tilesManager && requestWillCreateTileManager( r->width(), r->height() ) )
         {
             // if the image is too big. start using tiles
             qCDebug(OkularCoreDebug).nospace() << "Start using tiles on page " << r->pageNumber()
@@ -2131,6 +2131,11 @@
             m_pagesVector[i]->setSourceReferences( refRects.at(i) );
 }
 
+bool DocumentPrivate::requestWillCreateTileManager( int width, int height ) const
+{
+    return m_generator->hasFeature( Generator::TiledRendering ) && (long)width * (long)height > 8000000L;
+}
+
 Document::Document( QWidget *widget )
     : QObject( nullptr ), d( new DocumentPrivate( this ) )
 {
@@ -3155,17 +3160,17 @@
 
         request->d->mPage = d->m_pagesVector.value( request->pageNumber() );
 
-        if ( request->isTile() )
+        if ( request->isTile() && request->d->tilesManager() )
         {
-            // Change the current request rect so that only invalid tiles are
+            // Change the current request rect so that only tiles we really need are
             // requested. Also make sure the rect is tile-aligned.
             NormalizedRect tilesRect;
             const QList<Tile> tiles = request->d->tilesManager()->tilesAt( request->normalizedRect(), TilesManager::TerminalTile );
             QList<Tile>::const_iterator tIt = tiles.constBegin(), tEnd = tiles.constEnd();
             while ( tIt != tEnd )
             {
                 const Tile &tile = *tIt;
-                if ( !tile.isValid() )
+                if ( !tile.isValid() ) // no pixmap or pixmap is dirty
                 {
                     if ( tilesRect.isNull() )
                         tilesRect = tile.rect();
diff --git a/core/document_p.h b/core/document_p.h
--- a/core/document_p.h
+++ b/core/document_p.h
@@ -190,6 +190,10 @@
         // For sync files
         void loadSyncFile( const QString & filePath );
 
+        static DocumentPrivate *get( Document *doc ) { return doc->d; }
+
+        OKULARCORE_EXPORT bool requestWillCreateTileManager( int width, int height ) const;
+
         // member variables
         Document *m_parent;
         QPointer<QWidget> m_widget;
diff --git a/core/generator.cpp b/core/generator.cpp
--- a/core/generator.cpp
+++ b/core/generator.cpp
@@ -715,7 +715,7 @@
         .arg( req.height() )
         .arg( req.priority() )
         .arg( req.pageNumber() );
-    str << qPrintable( s );
+    str << qPrintable( s ) << req.normalizedRect();
     return str;
 }
 
diff --git a/ui/pageview.cpp b/ui/pageview.cpp
--- a/ui/pageview.cpp
+++ b/ui/pageview.cpp
@@ -1821,6 +1821,7 @@
     if ( d->items.isEmpty() )
     {
         resizeContentArea( e->size() );
+        d->delayResizeEventTimer->start( 200 );
         return;
     }
 
@@ -4615,6 +4616,10 @@
     if ( d->blockPixmapsRequest || d->viewportMoveActive )
         return;
 
+    // if we are in the middle of a resize storm, exit, the timer will call us back in a moment
+    if ( d->delayResizeEventTimer->isActive() )
+        return;
+
     // precalc view limits for intersecting with page coords inside the loop
     const bool isEvent = newValue != -1 && !d->blockViewport;
     const QRect viewportRect( horizontalScrollBar()->value(),
@@ -4683,7 +4688,10 @@
 #endif
 
         Okular::NormalizedRect expandedVisibleRect = vItem->rect;
-        if ( i->page()->hasTilesManager( this ) && Okular::Settings::memoryLevel() != Okular::Settings::EnumMemoryLevel::Low )
+        Okular::DocumentPrivate *docPriv = Okular::DocumentPrivate::get( d->document );
+        const bool requestWillCreateTileManager = docPriv->requestWillCreateTileManager( i->uncroppedWidth(), i->uncroppedHeight() );
+        if ( Okular::Settings::memoryLevel() != Okular::Settings::EnumMemoryLevel::Low &&
+            ( i->page()->hasTilesManager( this ) || requestWillCreateTileManager ) )
         {
             double rectMargin = pixelsToExpand/(double)i->uncroppedHeight();
             expandedVisibleRect.left = qMax( 0.0, vItem->rect.left - rectMargin );
@@ -4701,7 +4709,7 @@
             Okular::PixmapRequest * p = new Okular::PixmapRequest( this, i->pageNumber(), i->uncroppedWidth(), i->uncroppedHeight(), PAGEVIEW_PRIO, Okular::PixmapRequest::Asynchronous );
             requestedPixmaps.push_back( p );
 
-            if ( i->page()->hasTilesManager( this ) )
+            if ( i->page()->hasTilesManager( this ) || requestWillCreateTileManager )
             {
                 p->setNormalizedRect( expandedVisibleRect );
                 p->setTile( true );