How to make the gtk+ application run faster?

Hi All,
I am using GTK+2.12.2 on DirectFB on TI Davinci platform with 300MHz ARM processor. I observe that my GTK application takes around a second to open a window, and around a 700-800 ms to switch tabs. I have built it with O3 optimization in release mode.
How to speed up the application? Is there any way to build the libraries with different options to make it faster?
Harinandan S

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