Hello,
I have 2 servers with Plesk 12.5.30 running, the first with Centos 6 and apache 2.2, the second with Centos 7 and apache 2.4.6. On both I installed mod_pagespeed as described here: http://wpguru.co.uk/2014/03/how-to-install-apache-mod_pagespeed-on-centos-with-plesk/ (No nginx installed!)
On the first server everything worked fine out of the box, the wordpress website loaded very fast (below 1 sec.) and most insights-issues were solved.![Smile :) :)]()
On the other server...
Apache 2.4.6 crash after mod_pagespeed install (12.5.30 Update #23, Centos 7)
I have 2 servers with Plesk 12.5.30 running, the first with Centos 6 and apache 2.2, the second with Centos 7 and apache 2.4.6. On both I installed mod_pagespeed as described here: http://wpguru.co.uk/2014/03/how-to-install-apache-mod_pagespeed-on-centos-with-plesk/ (No nginx installed!)
On the first server everything worked fine out of the box, the wordpress website loaded very fast (below 1 sec.) and most insights-issues were solved.

On the other server...
Apache 2.4.6 crash after mod_pagespeed install (12.5.30 Update #23, Centos 7)