... by e.g.
- keeping some resources in memory instead of always saving them to disk
- have a worker thread for saving elements to disk / loading elements from disk
- somehow prevent files being written to disk whenever the Date header changes (which is needed to calculate the age of a resource, see QTBUG-18740)
This might result in a new class deriving from QAbstractNetworkCache or changes in the current QNetworkDiskCache.