Qt Creator no longer supports rapidly building sub-projects

In Qt Creator 4.1.0 a change was introduced under QMake Projects

https://code.qt.io/cgit/qt-creator/qt-creator.git/tree/dist/changes-4.1.0.md?h=4.1&L=49

*Changed `Run Qmake` from `qmake -r` to `qmake && make qmake_all` for Qt 5

The reason for this change was not articulated. The benefits are unclear?

However, there are certainly detrimental effects. One such effect of this change is to significantly slow down the build times for larger projects. qmake will now be invoked over files unrelated to the particular sub-project, which did not occur prior to this change.

How can the functionality that existed prior to 4.1.0 be restored?