Once the viewer comes up for one of those long-load-time books, subsequent loads are normal (well, I assume they're normal -- I haven't run across one of these instances that happens more than once on any given book). Editing the book doesn't make a difference.
Regarding the cache directory, is it supposed to be set? There doesn't appear to be any Calibre environment variables set anywhere. ...\AppData\Roaming\calibre\caches is empty and I don't see a cache directory anywhere under ...\Program Files\Calibre2. Of course, even if there were problems there, I'm on a NVME only system, so loading times shouldn't be in the multi-minute range for a ~ 1MB epub.
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