how enable file server . . . mikrotik limit freenas server

hello all
have rb450g limit my file server freenas from 90MB to less 4MB

i bridged 4 lan and only one gatway
first lan is wan
second it mynetwork
third card conect to mikrotik

and all pc when want data from

router ----- rb450 bridge
= network
= freenas
like this picture

i see freenass server give the router board 90MB but export only less 4MB to users

any one can advice me to stop this limitation of freenas file server

iam work on 4.11 which come with rb
mapnetwork.jpg
lans.jpg

UP
need help also

http://wiki.mikrotik.com/wiki/Manual:Switch_Chip_Features