TYPO3 Core

typo3/sysext/core/Configuration/DefaultConfiguration.php

    'LOG' => array(
        'writerConfiguration' => array(
            \TYPO3\CMS\Core\Log\LogLevel::WARNING => array(
                \TYPO3\CMS\Core\Log\Writer\FileWriter::class => array(
                    'logFile' => 'typo3temp/logs/typo3.log'
                )
            )
        ),
        'deprecated' => array(
            'writerConfiguration' => array(
                \TYPO3\CMS\Core\Log\LogLevel::WARNING => array(
                    \TYPO3\CMS\Core\Log\Writer\FileWriter::class => array(
                        'logFile' => 'typo3conf/deprecation.log'
                    )
                )
            )
        )
    ),

Because of the LogLevels being configured as constants instead of values the class LogLevel is loaded on every bootstrap of the system even if nothing ever will be logged since config default is loaded everytime

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/49228

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/49228