I have currently 30 CPU instances running minerd on Ubuntu (for XMR). Not all instances have the same CPU, but some of the instances have "Intel(R) Xeon(R) CPU E5-2650L v4 @ 1.70GHz". These instances are all rented Cloud Servers (VPS).
Now these instances give 30+ H/s each on average. Most of the instances can perform at 30 H/s consistently. But some instances which have exactly the same setup and CPU run at a much lower hashrate and perform at only 3 H/s.
What things can I check and how can setup these other instances to also make 30+ H/s? 30+ H/s per instance is profitable. 3 H/s is not profitable at all. Any ideas/suggestions?