jbuilder: Caching is working but slower

I’ve tried to use caching with collections (with multiple solutions) the problem is that when ever I try caching the response become slower consider the following example of a collection that renders 2 partials for every item in it (around 25 item)

    json.data do
      json.array! @organizations do |organization|
        json.partial! 'api/v1/organizations/organization', organization: organization
        json.partial! 'api/v1/organizations/links', organization: organization
      end
    end

without caching the average response time is around ~38ms (on average)

now with caching

    json.data do
      json.array! @organizations do |organization|
        json.cache! organization do
          json.partial! 'api/v1/organizations/organization', organization: organization
          json.partial! 'api/v1/organizations/links', organization: organization
        end
      end
    end

with the jbuilder default caching and dalli store is properly installed and configured (I could verify that there was no cache miss)

the average response is around ~59ms (on average)

using the syntax found on Cache Digest

json.data do
  json.cache! @organizations do
    json.partial! 'api/v1/organizations/organization', collection: @organizations, as: :organization
    json.partial! 'api/v1/organizations/links', collection: @organizations, as: :organization
  end
end

the average response time is ~41ms (on average), and the response is different than the other responses

    # Instead of getting
    [{ "data":{}, "links":{} }, { "data":{}, "links":{} }]
    # I get
    [{ "data":{}, "data":{}, "links":{}, "links":{} }]

but the cache digest of the file is a very big string that will easily exceed the unix max file name length. this is the filename for example.

    Cache write: jbuilder/organizations/5509f9284162643526000000-20150322012449497000000/organizations/5509e5924162643056020000-20150320223230684000000/organizations/550b54d8416264add2040000-20150321004501311000000/organizations/550e35704162640a98030000-20150322032224768000000/organizations/550e357b4162640a98050000-20150322032235260000000/organizations/550e35834162640a98080000-20150322032243162000000/organizations/550e35894162640a980a0000-20150322032249767000000/organizations/550e35904162640a980c0000-20150322032256464000000/organizations/550e35944162640a980e0000-20150322032300519000000/organizations/550e35984162640a98100000-20150322032304428000000/organizations/550e359c4162640a98120000-20150322032308542000000/organizations/550e35a04162640a98140000-20150322032312514000000/organizations/550e35a54162640a98160000-20150322032317066000000/organizations/550e35a84162640a98180000-20150322032320850000000/organizations/550e35ac4162640a981a0000-20150322032324716000000/organizations/550e35b04162640a981c0000-20150322032328643000000/organizations/550e35b54162640a981e0000-20150322032333651000000/organizations/550e35ba4162640a98200000-20150322032338114000000/organizations/550e35bd4162640a98220000-20150322032341889000000/organizations/550e35c14162640a98240000-20150322032345602000000/organizations/550e35c54162640a98260000-20150322032349739000000/3fcda1f9c320ab4284da56b4b2337cf5`

I’ve also tired Jbuilder Cache Multi

 json.data do
  json.cache_collection! @organizations do |organization|
    json.partial! 'api/v1/organizations/organization', organization: organization
    json.partial! 'api/v1/organizations/links', organization: organization
  end
end

and the response was around ~57ms (on average)

plus with both jbuilder cache and multi I’m getting a lot of these in the logs

Cache digest for app/views/api/v1/organizations/index.json.jbuilder: 3a51096b9c8da6a2cdb5b5a33ee58ea4
Cache digest for app/views/api/v1/organizations/_organization.json.jbuilder: 4a1f1d49c90fdd867d88701f8a3fd6e1
Cache digest for app/views/api/v1/organizations/_links.json.jbuilder: f2a881e125f95421d566edd571fdec73
Cache digest for app/views/api/v1/organizations/index.json.jbuilder: 3a51096b9c8da6a2cdb5b5a33ee58ea4
Cache digest for app/views/api/v1/organizations/_organization.json.jbuilder: 4a1f1d49c90fdd867d88701f8a3fd6e1
Cache digest for app/views/api/v1/organizations/_links.json.jbuilder: f2a881e125f95421d566edd571fdec73
Cache digest for app/views/api/v1/organizations/index.json.jbuilder: 3a51096b9c8da6a2cdb5b5a33ee58ea4
Cache digest for app/views/api/v1/organizations/_organization.json.jbuilder: 4a1f1d49c90fdd867d88701f8a3fd6e1

so is it something wrong with my implementation or machine or local environment ? Rails 4.2.0, and Jbuilder 2.2.11

I also posted this issue to StackOverflow