Why does moving the cursor peg the cpu in numbers?

Why does moving the cursor, even by one cell, peg the cpu in numbers?

Hello
Before posting yesterdays, I tested with a table of 4435 x 8 cells on the iMac described below.
I will be more precise than yesterdays.
Numbers recalculate the entire document after every change. A single new character is sufficient.
Twenty years ago, AppleWorks designers were kind enough to recalculate only what really needed.
It seems that new developers are not relying upon intelligence but upon processor's brute force.
Their code will be efficient … on the machines which will be available within at least five years.
Alas, at this time there will no longer be compatible with the operating system.
Given this awful coding, when AutoSave apply, it must write on disk an entire new index.xml file.
Same thing when Versions apply.
Under SnowLeopard these two features don't strike.
If you wish, you may send your 'offending' document to my mailbox so I will be able to check the way it behave here. Don’t worry, I don't take care of what is really stored, only of the doc's behavior.
Click my blue name to get my address.
Yvan KOENIG (VALLAURIS, France) jeudi 12 janvier 2012
iMac 21”5, i7, 2.8 GHz, 12 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.2

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