Yesterday I left LW is slowly hash all the tracks (c. 10,000) and this process took 6-7 hours. After another 5 hours I turned the iMac off and this morning booted up. LW is again hashing all the tracks (currently standing at 1600 out of 10,000 in 1 hour which is the same as before). What would be my next action or should I accept this is due to volume of tracks?