Thank you.
Will do tomorrow. Tied up today.
I think the problem was related to too many images on one page. I broke what amounted to a diagrams chapter into 5 different pages and the problem abated. Quite a bit.
I sort of raised two issues in my ramblings above. One was sigil too slow. That's been largely fixed by not having 20 or more images on a single page. There was one 3000 pixel wide image I put on its own page, all by itself. The slowdown is manageable now.
The other issue was my (eventual) desire to write how-to-do-it books with large amounts of embedded video. Perhaps I should have waited a week and put that in a separate thread. I think that's going to need a new technology. Like a PHP plugin to unzip an epub on a webserver. And serve it up as a website that reads epub and looks and acts like it would in hand held reader.
I'll get back to this tomorrow. Do what you suggested.
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