According to this website, enabling cgroups in the kernel can boost performances by sharing resources in a better way. In particular, the conclusion states that: 

Nevertheless, with a little trial and error, cgroups can help you improve the efficiency of your systems’ resource usage and avoid downtime due to overusage of a single service.

Kernel seeds, however, recommend to deactivate them altogether. They say:

Consider these [kernel] settings poison. They remain nothing but system slow-downs. They are all off by default [in the proposed kernel config file].

Who should I trust?