Windows 8 and 8.1 Forums


Windows 8.1 slowdown - CPU not clocking up

  1. #1


    Posts : 4
    Windows 8.1 64bit

    Windows 8.1 slowdown - CPU not clocking up


    Hi all,

    Need some help with my Windows 8.1 machine. I'm running on a Macbook Pro 2012 model, which until fairly recently was pretty speedy in all applications.

    Specs are:

    Intel i7-3740QM 2.7ghz CPU
    16GB RAM
    Geforce GT 650M
    512gb SSD

    Not a powerhouse in absolute terms, but certainly powerful enough to do what I want and keep up with my requirements of light gaming on older and undemanding titles, photoshop and lightroom work and basic productivity and web usage.

    Recently I've noticed slowdown across the board, with particular offenders being web browsers when viewing intensive sites (e.g. facebook), large Excel 2013 documents and any type of gaming. I know this is slowdown as opposed to the machine simply not being powerful enough for these tasks as I have previously received excellent performance from the same software - including very playable framerates from the games.

    I've run a few tests myself and as far as I can see, the error could be because my CPU is locked at its minimum speed. In the attached screenshot I'm running a big export of RAW files from Lightroom, which should cause the CPU to ramp up to something like full speed. Instead, it will run to 100% usage, but the CPU speed remains constant at minimum.

    Click image for larger version

    I've had a look at my power configs in the control panel, and the CPU is certainly allowed to run at 100% speed - estpecially in the high performance setting that I use most of the time when plugged in.

    Am I right in thinking the lack of CPU rampup is causing my performance issues (i.e., is that also going to be the case in 3d games where I can't alt-tab to the performance monitor window?) Is there some kind of log I can run to check CPU (and GPU) speed? And if so, what is causing my hardware to say locked to its minimum performance state?

    Is there anything I can do without a reformat? I was hoping to keep this machine running until Windows 10 comes along later this year.

    Alternatively, should I be looking at something completely different? Maybe the hardware overheating leading to a refusal to ramp up clock speeds?

    Cheers all!

      My System SpecsSystem Spec

  2. #2


    Posts : 11
    Windows 8.1 Pro


    Try changing the power mode to max performance and unlock your cores. See if that helps
      My System SpecsSystem Spec

  3. #3


    Posts : 4
    Windows 8.1 64bit


    Hi,

    I've tried cycling through the 3 power modes and none of them seem to have any effect.

    Anything else to try?

    Cheers,
      My System SpecsSystem Spec

  4. #4


    Are you setting all parameters manually in the UEFI BIOS ?
      My System SpecsSystem Spec

  5. #5


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by vrosa View Post
    Are you setting all parameters manually in the UEFI BIOS ?
    This doesn't exist on a Mac

    Check your temperatures using Macs Fan Control - control fans of any Mac & Boot Camp! | CRYSTALIDEA Software or HWMONITOR | Softwares | CPUID similar. It could be throttling due to heat.

    Can you also post a print of resource monitor CPU tab.

    You could also as a test change the minimum frequency in power options to 90% and see what happens but check the temperature first..
      My System SpecsSystem Spec

  6. #6


    Posts : 4
    Windows 8.1 64bit


    Hi,

    Thanks for your ideas Adam. Here's a few results:

    Firstly I set minimum CPU state quite high:

    Click image for larger version

    Then I monitored the idle temperature - just running the Windows desktop:

    Click image for larger version

    It's not super low, but it's not insane either.

    Then I ran a stress test using Prime 95. Here's the results:

    Click image for larger version

    That's after a minute or so's testing. The fans sped up and kept the temp hovering around that mark - the CPU frequency oscillated between 1.16 and 1.19 ghz.

    After finishing the test everything returned to normal.

    Finally, here's a shot of the CPU tab in resource monitor at idle (windows desktop):

    Click image for larger version

    I'm fairly sure that it's not a hardware issue. When I run the Mac OS everything is absolutely fine... It's also a new issue - hard to put a timeframe on it but it's not always been like this.

    Thanks for your continued help!
      My System SpecsSystem Spec

  7. #7


    Posts : 1,875
    Windows 10 Pro Prieview x64


    OK so not heat then and you are still stuck at ~45% frequency.

    You could try to install Hyper-V (in Windows Features) if you have 8.1 Pro. Not to use it - just it disables throttling if it is installed. I doubt it would work but is worth a try if you have Pro version.

    Hopefully someone else will have an idea (except for re-install like here Windows 8 Pro Throttling). I don't know I'm afraid.
      My System SpecsSystem Spec

  8. #8


    Macbook Pro 2012 model
    i lost it

      My System SpecsSystem Spec

  9. #9


    Posts : 4
    Windows 8.1 64bit


    Just to update you, I reformatted and everything is fine again. I tried disabling everything at startup, but that didn't help, so a reformat seemed the only way. Some software/drivers must have conflicted and broken something - it was physically running hot too, although not so hot it should have been throttling constantly.

    Thanks for the help attempts anyway!
      My System SpecsSystem Spec

Windows 8.1 slowdown - CPU not clocking up
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