Check this BIOS setting if your optical drives go slow

If your PC has a BIOS setting called “Aggressive LPM Support”, beware. I have three HDDs and two optical drives on a 6-channel SATA controller, and if this option is enabled, any attempt to access the optical drives is unusably slow, or may even hang the OS – so leave it disabled!

Hopefully this will save someone a headache.
SATA-Configuration_LPM.png