Z00A Mokee 7.1.2 Slow MTP Transfer

Z00A Mokee 7.1.2 Slow MTP Transfer
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I installed the version MK71.2-z00a-180704-RELEASE, in my Asus, it worked perfectly I had no problem I liked the system a lot, much higher than the factory, but I noticed that when I went to perform file transfer (MTP) transferecia began at 15Mb and was halved until reaching the speed of 500Kb, in the factory version it maintains the speed of 23Mb but the version of the android is 5.0 (Lolipop). How can I correct the transfer speed?