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No doubt exacerbated by working on epubs that have a single, quite-large, html file which perhaps contains many inline images? That, and a noisy debug build of Sigil (with the debug logfile configured/enabled) are the two most common things that will cause a considerable slowdown in Sigil's Preview load/refresh times.
But the exact same epub should still load/refresh in the same time using Sigil 1.5.1 as it does with Sigil 1.4.3 regardless of any power-management settings.
That doesn't mean there's not some specific (and as yet undetermined) set of circumstances that can cause a severe slowdown of Sigil (in any recent Sigil version) on Windows: graphics hardware/drivers, specific versions of Windows 10 and/or Defender definitions, security settings, other programs running, Qt-specific environment variables set at the session-level to support other Qt-based applications, time since last reboot, etc...
There's been too many reports of severe slowdowns on Windows 10 (with newer/beefier hardware than the aging laptop I use for testing) reported for me to dismiss them outright. I just know that it's not recent code-changes to Sigil that's the culprit.
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