QMovie has a QMap member whose implicit sharing feature is unused. So cut the QMap baggage above the underlying std::map and use the STL class directly, paying attention to the gotcha that QMap::insert(k, v) is std::map[k] = v. Also move-insert. NRVO does not apply here, and we can copy when we need to (when i == frameNumber). Saves a bit more than 1KiB in TEXT size on optimized Clang 19 Linux AMD64 builds. Pick-to: 6.10 6.9 6.8 Change-Id: I40dce95689482db3ecbe1015c18ba0ed32d39a7b Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>