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[Andrew Carter <question678560@xxxxxxxxxxxxxxxxxxxxx>]

Question #678560 on qpdfview changed:
https://answers.launchpad.net/qpdfview/+question/678560

Andrew Carter proposed the following answer:
I’ve run into a similar issue where my CPU usage spiked to 100% during
rendering tasks, and it turned out the real cause was a bottleneck
between my CPU and GPU. If you haven’t already, it might be worth
checking whether your current hardware setup is balanced.

This tool helped me understand the bottleneck in my system:
https://bottleneckcheck.com. You can use or tools as well, they give you
an idea. It’s free and gives you a quick idea of which component might
be slowing the rest down.

Also, keep an eye on background processes and power settings. Sometimes
the issue isn’t with the code, but with how the hardware is managed.

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