Mobile devices are much less powerful than a PC, so there could be any number of issues. That said, one common issue is updating text every tick or too often, this is a very resource hungry process on any device but will slow down mobile devices especially.
but i do just some litle modify.. and all go down..
in every tick i have a lot of text
score diamon type of enemy killed...
but i do 1 every tick cause i know this command can use a lot of energy