Building smart previews much slower in Lightroom 6 than in Lightroom 5

Building smart previews is much slower in Lightroom 6 than in Lightroom 5.
Creating a smart preview from a DNG (Fuji X-E1 raw file) takes about 12 seconds.
Enabling/disabling GPU accelaration does not really make a difference.
When monitoring the Lightroom process with Process Explorer the GPU usage is always 0.
Below is my system specification.
Anyone got some idea why this might be?
Wilhelm
Version von Lightroom:  CC 2015 [1014445]
Lizenz: Abgelaufene Testversion
Betriebssystem: Windows 8.1 Business Edition
Version: 6.3 [9600]
Anwendungsarchitektur: x64
Systemarchitektur: x64
Anzahl logischer Prozessoren: 4
Prozessorgeschwindigkeit: 2,3 GHz
Integrierter Speicher: 8071,2 MB
Für Lightroom verfügbarer phys. Speicher: 8071,2 MB
Von Lightroom verwendeter phys. Speicher: 655,5 MB (8,1%)
Von Lightroom verwendeter virtueller Speicher: 692,1 MB
Cache-Speichergröße: 0,0 MB
Maximale Anzahl Threads, die Camera Raw verwendet: 2
Camera Raw SIMD-Optimierung: SSE2,AVX,AVX2
DPI-Einstellung des Systems: 144 DPI (High-DPI-Modus)
Desktop-Komposition aktiviert: Ja
Monitore/Anzeigegeräte: 1) 2560x1440
Eingabetypen: Multitouch: Ja, integrierte Toucheingabe: Ja, integrierter Stift: Nein, externe Toucheingabe: Nein, externer Stift: Nein, Tastatur: Nein
Informationen zum Grafikprozessor:
Intel(R) HD Graphics 5500
Check OpenGL support: Passed
Vendor: Intel
Version: 3.3.0 - Build 10.18.14.4029
Renderer: Intel(R) HD Graphics 5500
LanguageVersion: 3.30 - Build 10.18.14.4029
Anwendungsordner: C:\Program Files\Adobe\Adobe Lightroom
Bibliothekspfad: C:\Users\wmedetz\Lightroom\Lightroom Catalog.lrcat
Einstellungen-Ordner: C:\Users\wmedetz\AppData\Roaming\Adobe\Lightroom
Installierte Zusatzmodule:
1) Behance
2) Facebook
3) Flickr
Config.lua-Flags: None
Adapter Nr. 1: Anbieter : 8086
  Gerät : 1616
  Subsystem : 222717aa
  Version : 9
  Grafikspeicher : 0
Adapter Nr. 2: Anbieter : 1414
  Gerät : 8c
  Subsystem : 0
  Version : 0
  Grafikspeicher : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: Lautsprecher/Kopfhörer (Realtek High Definition Audio)
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 44100
Build: Uninitialized
Direct2DEnabled: false
GPUDevice: not available
OGLEnabled: true

I know that is the official line but copying speed is fine in Windows 8 under Parallels. I have the latest Windows 8 Broadcam driver installed for the network adapter in Boot Camp and everything else works fine.
I can download a file from the Internet 10x faster than I can from my Airport disk in the next room in Boot Camp!

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