Current Server. On my 6 core it takes 0.14 seconds at the live server without traffic peaks. Centos 6.5 centminmod. 0.018 seconds are for mysql. iostat shows around 85 tps.
On all machines. Also all custom compiled with the same parameters. The exception is centos mariadb on all servers. (Yum install MariaDB...). I disabled xf cache on all machines and didn't notice any differences. Load is usually around 0.05-0.10.
Is that because of the slower amazon ebs network hdds? Amazon RDS is slow for all their instances (from free microinstance up to 400 USD monthly instances).