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The A4 chip in the 4 doesnt handle ios7 to well.
This should answer your question:
APPLICATION IOS 6.1.3 IOS 7.0 GM
Safari 1.13 seconds 2.05 seconds
Camera 1.9 seconds 2.63 seconds
Settings 1.31 seconds 1.88 seconds
Mail 1.0 seconds 1.50 seconds
Messages 1.57 seconds 2.80 seconds
Calendar 1.23 seconds 1.78 seconds
Phone 0.67 seconds 2.37 seconds
Cold boot to lock screen 31.14 seconds 45.13 seconds
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