ThreadWeaver is a programming library developed for KDE 4 by Mirko Boehm that allows developers to easily take advantage of multi-core processors. In ThreadWeaver the workload is divided into individual jobs, then relationship between jobs (what order they should be completed or which has a higher priority); from that ThreadWeaver will work out the most efficient way to execute them. Krita

Krita

Krita is the digital painting and illustration software included based on the KDE Platform and Calligra Suite libraries. Designed as a digital painting and illustration suite, Krita is free software and distributed under GNU General Public License...

has implemented visual filter previews using ThreadWeaver to prevent GUI lockups.