Optimizing decompression speed

  • Patrick Lafont
    Patrick Lafont

    Hi all,

    I'm trying to get the best out of my somewhat expensive hardware and I seem to reach a limit in the decompression speed of RAR archives and I can't tell which component is causing that.

    Basically I have an i7 3930k that gives me a 300mb/s rate from performance test. I perform the test with a 512gb SSD rated with 500mb/s read speed as source and ramdisk as target to avoid any bandwidth limitation and I get something around 100mb/s.

    I try on another computer, i5 3470 and a slower ssd and I get 90mb/s.

    I can't figure out why I cannot get better speed, as I understand CPU is not heavily used for decompression (or is it only using one core and CPU is still the bottleneck?). Could the OS limit it somehow? I have Windows 8.1 installed on both.

    Thanks for any tips you can share!


  • Igor Pavlov
    Igor Pavlov

    Yes, 7-Zip uses only one CPU thread for RAR decompression.