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JLius I guess it could be the spellchecker/dictionary. However, I use a 7.85MB EN_GB dict with 674K words, the EN-GB dict that calibre ships is 0.68MB with 56K words. Its a tad slower with the big dictionary - eg 4s v 1s to open the spell check list - but no time outs.
Many 'not responding problems' are due to program A and program B getting into deadly embrace over some resource or other. One thing to try is to give Calibre an exclusive temporary area - see CALIBRE_TEMP_DIR in
http://manual.calibre-ebook.com/cust...ment-variables.
On the spell checker issue - try editing an English language book with the default EN-US dictionary, calibre uses the hunspell tools see
http://hunspell.sourceforge.net/ Interestingly a couple of Dutch language authorities are major sponsors of the project.
BR