mod_mam speed

Hello.
Is it (sent message per second) different with or without mod_mam?(how many)
I have no limitation in resource.
I test it, when use mod_mam in mysql I sent messages 50.000 but I read 100 messages.
my ejabberd configure is

c2s_shaper:
    admin: none
    all: none
  ## All S2S connections use the "fast" shaper
  s2s_shaper:
    all: none

and mod_mam

mod_mam:
    default: always
    cache_size: 1000
    cache_life_time: 3600

how can I change my configure and increase read messages?
I using ejabberd 15.11.
thanks alot.

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