Looking up the QMetaProperty from a Qt::ItemDataRole value requires a QHash lookup of the role name, then a lookup of the property index in the QMetaObject, and then the (cheap) construction of the QMetaProperty from that index. If all items in the model are of the same meta-object type (in which case has_metaobject<row_traits::item_type> is true at compile time), then we can build a cache from Qt::ItemDataRole to QMetaProperty. Give ModelData a base class that is specialized on this trait, and add a cache to the specialization. Otherwise the base class is empty and doesn't introduce any overhead. Invalidate the cache when the role names change. Pick-to: 6.10 Change-Id: I0985327e8c66a5467d4ea1da0ec62b7dfa85501f Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>