For a given image, like the one on, this can take up to 700 ms. However, when the image is in an hyperlink (after the proposed patch for JDK-8160597 is applied), QuantumClipboard::readImage goes through new Image(url) on every call, again without background loading. takes 2 ms) as it doesn't call new Image(url). If the image is not in an hyperlink, the load is done via pixels/rawData, which is really fast (the first image of. On Mac, however, SystemClipboard::popFromSystem is used. Similar values on Windows 10 with 18-ea+6: Running the attached test from Ubuntu 20.04 with JavaFX 18-ea+6 gives: On Windows and Linux, dragging an image from a web page (wrapped or not with an hyperlink) uses Clipboard::getLocalData, and QuantumClipboard::readImage tries to create a new Image(url) on every call, without background loading, which takes around 200 ms for the first image of. This issue can be reproduced on all platforms and JavaFX versions, but there are different cases.

This means that such content (for instance, an Image), is being retrieved from a given URL over and over again (via QuantumClipboard::readImage), on every mouse move/drag over, causing a high lag in showing the image and moving it as the drag view. WebView has a drag and drop eventHandler which is added to several drag events:Īs part of this eventHandler, the dragboard content is retrieved from QuantumClipboard, which has a cache strategy in place, but unfortunately the cache is flushed away when the drag events starts (QuantumToolkit::startDrag).

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