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I have a similar i7 system on my old laptop but with 32 meg and see no 3 second delay. So something is interfering with Preview loading on your machine or it uses a corrupted font. Perhaps, creating two chapters with text garbled (there is a sigil plugin to do that) so that it can be posted here in public would allow other Windows users to test and report back.
Perhaps it is a Windows specific issue? I just can't see it on my old intel mac laptop.
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