Set the paragraph and formatting style manually. Do not use heuristic for the formatting. This will reduce the amount of processing calibre does to A) determine the paragraph style and B) format the text.
Heuristic formatting uses, you guessed it, heuristics and the larger the text the more it needs to process. Most heuristics are a series of regular expressions and increasing the amount of text will drastically slow down the process. Every regex needs to run over the entire document. So every line you add every regex needs to run over that much more text.
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Originally Posted by forceps
How about an option of convert plain txt to "plain" mobi, no sections, no fonts, just like read a plain txt file, but in mobi format.
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Again, actually look at the options that are available. Formatting style: plain. This will do what you're asking for.