-
Bug
-
Resolution: Unresolved
-
P2: Important
-
None
-
6.9.2
-
Linux/Wayland
There is a big regression in delivering input events in Qt Quick. Attached example in callgrind shows:
Qt 5.15.18
==1572525== I refs: 15,930,854,003
Qt 6.9.2
==1572827== I refs: 64,225,641,185
And QQuickItemPrivate::itemToParentTransform() seems to jump out. It is the highest cost function in Qt 5.15.18 also, but in Qt 6 this function is now called many more times for a single event than it used to in Qt 5.
This causes issues with lower end devices where simple mouse moves take 4x as much CPU time as before.
| For Gerrit Dashboard: QTBUG-140340 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 682427,1 | WIP stop sending hover events from handleMouseEvent() | dev | qt/qtdeclarative | Status: NEW | -2 | -1 |
| 682467,1 | Cache input and output from QQItemPrivate::mapFromScene() | dev | qt/qtdeclarative | Status: NEW | 0 | -1 |