Controlling of IDOCs in XI

HI frnds,

I hav a scenario IDOC(R/3)-IDOC(ECC5.0).. where we need to post material data into ECC system..

Problem is 6 idocs generating in R/3 per minute and the same transferring into XI system..but here my ECC system is not capable of handling 6 idocs in a minute.. its very slow..

its giving error in xi system.. so how can i controll idocs in XI system so that they can transfer into ECC system atleast with 1 minute gap..