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Hi Michael

Michael Meeks-2 wrote
The good news is - that
that structural change is underway inside LibreOffice - Kohei is doing
some great work there as of recently. 

Those are EXCELLENT news :)
It is good to know that it is not a limitation. It simply wasn't added in
yet. Actually I found out that Excel 2003 had the same problem with
cores/threads (in addition to the limit of lines).
Looking forward to test 4.1.0 rc1 next month !

Michael Meeks-2 wrote
Opening a heavy (200k lines x 26 cols) xlsx file takes 6 seconds in a
Core i5 (2 cores, 4 threads) using MS Office 2010. I can see the first 3
threads briefly going up to 70% load and it's loaded.

      It is entirely possible that Excel can parse and import sheets
separately since they are in separate streams inside the DOCX file -
that is not an option open to LibreOffice & ODF which embeds them all in
the same XML stream; calculation in Excel is threaded too.

No, this is a single sheet. Actually I was considering saving as ODF to
test, but I can see that won't help at all.

Michael Meeks-2 wrote
Using Calc 4.0.2 after waiting 5 minutes watching the first thread at
85% load (and the fan whirring like crazy), I gave up waiting.

      That is almost certainly completely unrelated to any form of threading
issue, and down to the world's lamest selection of algorithms and
implementations as showcased in the calc core :-) again Kohei is working
hard on doing some larger changes here for LibreOffice 4.1.

Great! Looking forward to a brand new Calc!

Thank you for your extensive answer! I'm sure this is interesting and
exciting for all Calc users!

Kind regards,

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