I'd be curious about hardware as well. I've got a tired old laptop that I test Sigil on, and even with chapters that have tons of images, I'm nowhere near 5 seconds on refresh. It's typically under a second. As far as complete Preview disconnects go, that doesn't really happen to me. I'd suspect Antivirus/Anti-Malware. That's why I always exempt Sigil's program directory and Preferences directory from active Anti-Malware scanning on any machine I use Sigil on.
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