=== strawberry-0001: In ScanSubdirectory(), `files_on_disk` is a QStringList (linear container). ===
N=100   k=100  : defective=0.097ms  fixed=0.004ms  speedup=25.5x
N=500   k=500  : defective=2.457ms  fixed=0.023ms  speedup=108.4x
N=1000  k=1000 : defective=9.842ms  fixed=0.051ms  speedup=191.4x
N=2000  k=2000 : defective=40.153ms  fixed=0.098ms  speedup=408.4x

=== strawberry-0002: In ScrobblerCache::Flush(), the method iterates cache_items (F items) ===
N=100   k=100  : defective=0.088ms  fixed=0.003ms  speedup=25.3x
N=500   k=500  : defective=2.156ms  fixed=0.020ms  speedup=106.6x
N=1000  k=1000 : defective=9.430ms  fixed=0.051ms  speedup=184.9x
N=2000  k=2000 : defective=39.475ms  fixed=0.098ms  speedup=402.5x

