[TYPO3-core] RFC #12232: Bug: md5_file() to check if a file has been changed is very expensive [performance]

[André Stösel]

This is an SVN patch request.

Type: Bugfix

Bugtracker references: http://bugs.typo3.org/view.php?id=12232

Branches: "TYPO3_4-4 & trunk"

Problem:
With every new page creation a md5_file() check is done to see if the
file has been changed. This is a large large performance issue.

Solution:
Check filemtime instead.

Notes:
There is an option to switch the behavior because of potential issues
in special cases (ftp upload,...).
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