In your shortcut
after the ….\Guild Wars 2\Gw2.exe"
Where … is from your root to the Guild Wars 2 directory
make it:
…..\Guild Wars 2\Gw2.exe" -assetsrv 62.154.232.187:80"
Restart GW2
Then that last file will complete in under 1 second!
Then remove the -assetsrv 62.154.232.187:80" from your shortcut and play as usual