What this phrase "Try to make you architecture more horizontal rather than vertical" means?

Posted by Kirzilla on Stack Overflow See other posts from Stack Overflow or by Kirzilla
Published on 2010-04-14T08:18:47Z Indexed on 2010/04/14 8:23 UTC
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Performance

Hello,

I've just listened to http://www.zend.com/webinar/PHP/70170000000bAuS-webinar-php-performance-principles-and-tools-20100218.flv (Zend webinar about PHP performance).

I can't understand what this phrase means "Try to make you architecture more horizontal rather than vertical" (see screenshot)

alt text

Thank you.

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