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Speed on external monitor vs laptop screen

Jason
I'm using a 2015 Macbook Pro with 3.1 GHz Dual-Core Intel Core i7 and 16gb of RAM. C1 is extremely laggy on this machine. I've noticed that, when using the program on an external monitor, C1 runs more smoothly. Unfortunately, this is a cheap monitor unsuited for photo editing. It seems strange, though, that this would occur, as my impression was that the computer would be doing more work to display the program externally.

Either way, I'm trying to get going in the photo business and can't accept the slow speed on my laptop. Edits would take forever. Considering an upgrade, however, the speed difference on my monitor tells me that maybe something else is going on. LR is much faster, which is the opposite of what I often hear in C1 comparisons. Any tips for reducing the laginess?
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5 comments

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  • Ken Bates
    It could be the GPU utilization. When you plug in an external monitor, the MacBook switches from using the integrated (slow) GPU to the discrete (fast) one. Capture One is rather poor when it comes to invoking the GPUs, so forcing the switch to the fast one by plugging in an external monitor may be what is making the speed difference. To check this, fire up the Activity Monitor, go to the 'Window' menu and select 'GPU history'. You should see two panes; one for the discrete GPU (Radeon R9 M370X) and one for the integrated one (Intel Iris Pro). Do some work in C1 and watch the GPU graphs, then plug in the external monitor and see if the discrete GPU starts working.

    Not saying the GPU (or lack thereof) is what is making the speed difference in C1, but it's worth a check.

    - Ken
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  • Jason
    macbates wrote:
    It could be the GPU utilization. When you plug in an external monitor, the MacBook switches from using the integrated (slow) GPU to the discrete (fast) one. Capture One is rather poor when it comes to invoking the GPUs, so forcing the switch to the fast one by plugging in an external monitor may be what is making the speed difference. To check this, fire up the Activity Monitor, go to the 'Window' menu and select 'GPU history'. You should see two panes; one for the discrete GPU (Radeon R9 M370X) and one for the integrated one (Intel Iris Pro). Do some work in C1 and watch the GPU graphs, then plug in the external monitor and see if the discrete GPU starts working.

    Not saying the GPU (or lack thereof) is what is making the speed difference in C1, but it's worth a check.

    - Ken


    Thanks. I didn't know this about Macbooks. My computer is a 13" and only has the built in GPU - Intel Iris 6100. I just did some work on the laptop screen, then plugged in the monitor and tried again on the external monitor and the performance change is immediate and noticeable. On GPU history, I noticed that the graph at the bottom remains smaller when using the external monitor, as though the GPU is doing less work.

    The monitor is lower resolution, while the Macbook screen is HD/Retina. Maybe this is the reason.
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  • Permanently deleted user
    Hi,

    Did you try to switch the "hardware acceleration" to never rather than auto in the preferences ?
    Robert
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  • Jason
    tenmangu81 wrote:
    Hi,

    Did you try to switch the "hardware acceleration" to never rather than auto in the preferences ?
    Robert


    Yes, have tried both. It seems slightly faster with 'Never' in both settings, which seems backward to me.
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  • SFA
    NNN637107547511450429 wrote:
    tenmangu81 wrote:
    Hi,

    Did you try to switch the "hardware acceleration" to never rather than auto in the preferences ?
    Robert


    Yes, have tried both. It seems slightly faster with 'Never' in both settings, which seems backward to me.


    You could check the log file that C1 creates when assessing the system for available OpenCL capable GPU options.

    Frequently built in GPUs will not offer the performance to make using them worthwhile or simply to not have enough memory access to be useful for photo editing activity with C1. No point in using them if the CPU is going to be faster.

    However whether something like that might be the case with your system is something you might only really know from the log files or, possible, the status information under the usage controls for Hardware Acceleration in the Preferences - although I am not sure if that is just a message based on the current settings or if takes into account whether there is a currently available GPU of some sort.


    HTH.


    Grant
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