Thank you for answer paulpeer
I have donloaded Sigil and combined html files by adding existing files in tetx section. I guess creating chapter breaks is not necessary (every page is a chapter in itself).
The epub file is about 2 MB and it takes some time to load it in firefox (EPUBReader), but when I access the file through bookmarks -> epub catalog, it loads instantly. I also converted 14 MB file and it takes even longer to load it when accessing through windows explorer, but It loads instantly through epub catalog.
Is there a way to speed up loading process, can the file be somehow optimized?
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