Confused about memcache

I installed a memcache on the same foreman server. Memcache is running on
localhost port 11211, i configured foreman to use it.

Production log:

2016-10-28 20:52:30 [app] [I] memcached cache backend enabled: [:dalli_store
, "192.168.11.237:11211", {:namespace=>"foreman", :expires_in=>86400, :
compress=>true}]
2016-10-28 20:52:33 [app] [I] memcached cache backend enabled: [:dalli_store
, "192.168.11.237:11211", {:namespace=>"foreman", :expires_in=>86400, :
compress=>true}]

But i can't notice any perfomance difference. I installed monitorix to
check how much ram it using right now but it is only under 1MB, see picture.

Maybe somebody can share his experience with this plugin please?