Hey Florian,
I have tried to install EasySocial on your site and this time around, it seems to be working fine. I have checked the php configuration and the max_execution_time is still set to 38 seconds.
Just for your information, our scripts does not require more than 38 seconds but if you are on a shared hosting server, it adds a lot of other implications if the server is busy.
For instance, just imagine your computer (that is idling) copying a 100mb file from disk A to disk B, it would take about less than a second. However, if you are encoding videos or running something heavy at the background, the copying speed is definitely going to take more than 1 second. I believe this would give you an idea about why we requested to increase the max_execution_time in php.