It's still done. JavaFX does dirty region tracking for example, e.g. here https://github.com/openjdk/jfx/blob/master/modules/javafx.graphics/src/main/java/com/

It's still done. JavaFX does dirty region tracking for example, e.g. here https://github.com/openjdk/jfx/blob/master/modules/javafx.graphics/src/main/java/com/sun/prism/es2/ES2SwapChain.java#L55 https://github.com/openjdk/jfx/blob/master/modules/javafx.gr... and that's a toolkit that's still relatively modern (it was ahead of its time). For example the UI thread is separated from the rendering thread, so one core can be computing the layout/processing events/doing animations for one frame whilst another core renders another frame to a GL/D3D command stream.