We are using CiviCRM on an existing Joomla site. We first installed CiviCRM and installed afterwards the (localization) language files.
But when selecting an other language then the default US-EN, the system almost hangs. In the resource monitor we can see that the I/O read/write hits the seeling and almost runs out of resources. It happens on the CiviCRM Admin page and also on the front-end pages where we use CiviCRM.
The strange thing is that it worked fine the first time, right after installing the localization files. But some day's later the system became slower and eventually almost hanged. We also tried a clean install of CiviCRM with localization files, but it gave the same problems.
When switching back to the US-EN language it works fine again.
We tried it in both single and multi-language modus.
We use(d) and tried:
CiviCRM 4.7.25 and 4.7.27 whith the corresponding localization files.
PHP5.6 / PHP 7.0 and PHP 7.1 with memory_limit 512MB
Apache libmysql - mysqlnd 5.0.11-dev
Can this be a bug specific to our kind of installation on Joomla/environment? Of do we do something wrong here?