Qt has GPU-accelerated graphics with the QtQuick scene grqph since 2014. Qml is a declarative language and quite easy to learn with Js based property bindings. It also has an inspector with Gammaray and many profilers (e.g. hotspot,heaptrack, qt creator profilers, kcachegrind, massif,...). The real reason why people are not using it more is the licensing LGPL3 is a bit too scary for some people and the commercial license to expensive