There is one setting i.e.
Preferences/Heuristics/Ensure scene breaks are consistently formatted
Which when selected (on my setup) extended the conversion period on some files from <1min to multiple hours. Deselecting this setting for me has all but removed all of the excessive conversion times. At last I no longer have to listen to the fan (on a brand new PC, not silted up with fluff oldie) whirring like mad whilst I try to get some shut-eye.
I have not seen any difference in the output so have my fix and very happy.
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