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Hi KevinH,
I will try to assist you as far as I am capable of.
My system is on Win 10 Pro, details in system.txt. I have used a fresh install of Sigil 1.5.1 to run some tests, after uninstalling Sigil 1.3.0. first.
I have used a Sherlock Holmes epub from Standard Ebooks as an example, also attached.
Opening chapter 12
Sigil 1.3.0 < 1s
Calibre 5.14 < 1s
Sigil 1.5.1 6s
Searching for cocaine-bottle at the end of chapter 12
file closed
Sigil 1.3.0 < 1s
Calibre 5.14 < 1s
Sigil 1.5.1 6s
file open
Sigil 1.3.0 < 1s
Calibre 5.14 < 1s
Sigil 1.5.1 6s
file open and active
Sigil 1.3.0 < 1s
Calibre 5.14 < 1s
Sigil 1.5.1 <1s
Searching for thought with 57 occurrences showed that Sigil 1.5.1 slows down each time it has to skip to another chapter file. As long as it is in the same file it is equal tot 1.3.0 and Calibre.
Strangely enough the count all option in all three programs instantly shows 57.
Another thing I have noticed is, it takes 5s - 6s in Sigil 1.5.1 before the pop-up menu disappears after selecting any word and right-clicking and selecting copy, 1.3.0 and Calibre respond instantly.
I really hope this information can put you on the right track, to find the cause of the slow downs.
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