RedisにIDのリスト(100万件)を格納するときgzip圧縮するべきか

$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
$ grep redis Gemfile.lock
    redis (3.3.1)
    redis-actionpack (5.0.1)
      redis-rack (>= 1, < 3)
      redis-store (>= 1.1.0, < 1.4.0)
    redis-activesupport (5.0.1)
      redis-store (~> 1.2.0)
    redis-rack (2.0.0)
      redis-store (~> 1.2.0)
    redis-rails (5.0.1)
      redis-actionpack (~> 5.0.0)
      redis-activesupport (~> 5.0.0)
      redis-store (~> 1.2.0)
    redis-store (1.2.0)
      redis (>= 2.2)
  redis (~> 3.0)
  redis-rails

$ bundle exec rails c

[1] pry(main)>

[1] pry(main)> ids = (1..1_000_000).to_a

[2] pry(main)> json = ""
=> ""
[3] pry(main)> marshaled = ""
=> ""

[4] pry(main)> Benchmark.realtime { marshaled = Marshal.dump(ids) }
=> 0.06611821899423376
[5] pry(main)> marshaled.size
=> 4934095

[6] pry(main)> Benchmark.realtime { json = ids.to_json }
=> 0.7926974160072859
[7] pry(main)> json.size
=> 6888897

[8] pry(main)> host = "192.168.99.100"
=> "192.168.99.100"
[9] pry(main)> port = 6379
=> 6379
[10] pry(main)> db = 0
=> 0
[11] pry(main)> redis = Redis.new(url: "redis://#{host}:#{port}/#{db}")
=> #<Redis client v3.3.1 for redis://192.168.99.100:6379/0>

[12] pry(main)> res = ""
[13] pry(main)> Benchmark.realtime { redis.set('cachekey', marshaled) }
=> 0.08158121499582194
[14] pry(main)> Benchmark.realtime { res = redis.get('cachekey') }
=> 0.34710412900312804
[15] pry(main)> res.size
=> 4905295

[15] pry(main)> gzip = ""
=> ""
[15] pry(main)> gzip2 = ""
=> ""
[15] pry(main)> res2 = ""
=> ""
[16] pry(main)> Benchmark.realtime { gzip = Zlib::Deflate.deflate(marshaled); redis.set('cachekey_gzip', gzip) }
=> 0.6087514339888003
[17] pry(main)> Benchmark.realtime { gzip2 = redis.get('cachekey_gzip'); res2 = Zlib::Inflate.inflate(gzip2) }
=> 0.06563029202516191
[18] pry(main)> gzip.size
=> 1505444
[19] pry(main)> gzip2.size
=> 1448046
[20] pry(main)> res2.size
=> 4934095