There were two reasons for it:

1) KisImageAnimationInterface::totalLength() used to recursively
   recalculate the length of the shot on every call to columnCount(),
   which is called from hasIndex() and as a consequence from everywhere.

2) Layer properties icons and i18n in KisBaseNode::sectionModelProperties()
   were loaded every time from the resource files.

Conflicts:
	krita/image/kis_base_node.cpp
	krita/image/kis_group_layer.cc
	krita/image/kis_layer.cc
	krita/image/kis_paint_layer.cc
	krita/image/kis_selection_mask.cpp
	krita/ui/canvas/kis_animation_player.cpp