How to enable the PHP opcache JIT compiler on Debian Bookworm
PHP 8.0 introduced a new JIT compiler, which theoretically decreases the processing time for PHP-generated content. According to the official instructions, it’s very easy to enable, but it is disabled by default in Debian and requires some slightly different configuration changes to re-enable. Be aware that the Debian maintainer decided to disable it due to reports of segfaults from some users.