地图卡顿 "map lag" #3656

I can reproduce this. Large maps with a lot of tiles seem to have more hitching/lag when panning zoomed out. This affects both MMB drag, and space+drag.

The main difference between 1.9.2 and 1.10 is the switch to Qt6, so perhaps it's something to do with that.

The main difference between 1.9.2 and 1.10 is the switch to Qt6, so perhaps it's something to do with that.

In that case, it would be interesting to know whether the problem is also reproducible with the 32-bit Windows builds, which are still using Qt 5.15.2. They are the "Windows 7-8" builds at https://github.com/mapeditor/tiled/releases/tag/v1.10.1.

Windows 7, Tiled 1.10.0 here. I reproduced the steps : create a 256x256 map, fill it with the bucket tool with one tile, zoom out with ctrl-wheel to 1%, and I can drag the map with the middle button without any freeze or slow.. except small ones (and high cpu usage) when I drag it outside of the viewport (I mean, when part of it is "hidden" behind other parts of the app like the toolbar on the top of the screen, or the properties panel on the left) : small freezes. I tried with a 1024x1024 window, same result except longer freezes when part of the map is out of sight (1-2s). In both cases, if the map stays fully visible, no noticeable freeze / cpu usage peak.

In both cases, if the map stays fully visible, no noticeable freeze / cpu usage peak.

This is normal because in this case the visible map is simply moved on the screen, instead of being re-drawn. This is an optimization, which is not possible when moving the camera makes a previously invisible part of the map visible.

But in that regard, nothing should have changed between 1.9 and 1.10.