Significant FPS drop after multitasking

I was having a lot of FPS issues with my project so I thought ill try making a simple scene and test it on Samsung galaxy S and S2.

In Samsung galaxy S the drop (From 60 to 20 FPS) is significant and hardly recovers. In Galaxy S2 it works perfect (60 FPS) . Any thoughts?? Please help.

I would guess that that’s due to the fact that the “galaxy S” is a single core CPU and “galaxy S2” are a dual core CPU.

If there are some busy-waiting in the 2:nd thread/task, then you are in trouble.