Cache 

The Handlebars cache is called handlebars and is registered by default when installing and activating the extension. Its cache backend is not configured explicitly and therefore uses the default setting (database cache).

You can specify a different cache backend as follows:

# ext_localconf.php

if (!isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['handlebars']['backend'])) {
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['handlebars']['backend']
        = \TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::class;
}
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