Is the iPhone 4s much faster than the iPhone 4?

I'm now eligible to upgrade my phone (I currently have the iPhone 4). I wanted to know if getting the 4s is worth the upgrade. Is it a lot faster than the 4? Besides speed, what other advantages does the iPhone 4s have than the 4?

Thank you,

Btw, I do not want to get the iPhone 5

Yes, it's much faster.

It has Siri
a faster processor
better camera
better display
that's all i remember lol

Noticeably faster than the 4.

Siri
1080p HD video
8MP with stabilization
64GB model
Better Bluetooth support
Dual-core processor
Improved graphics
Improved GPS
Speech to Text
Bigger battery
Louder speakers

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