Bad performance in certain machines

Hello,

I Got very pretty simple 2d game… it works very good on most machines (Even 8 year old ones)

But for example in machine setup (That is pretty new):
7-3770 ,gtx960, RAM 32gb.

Performance goes very very bad… What might cause this kind of “machine bound problem”?
Same time game runs ok on machine with worser CPU,worser garphic card, worser RAM

Make a development build , enable the profiler and connect to the build version of the game over network to figure out what’s going on.