Why is Siri on iphone so slow?

I'm thinking of selling my iphone 4s and getting a nexus or siii. I use a lot of voice search commands and siri is just too slow.

can i make siri faster?

No, its slow because it has to connect to apple every time you use it and their servers are overloaded.

I will suggest you to sell your iPhone and buy the latest iPhone again or you can buy Samsung Galaxy Ace III.
To make siri faster you have to port Siri to your iPhone 4s and observed that it doesn't run as fast as before. With this simple jailbreak tweak called "QuickSiri" you can make it run faster on older iOS Devices. Another great feature of this tweak is that it makes Siri run in full screen instead of ¼ of screen.
To sell your iPhone 4s as well as getting better support you can open or register a account in the online shop like e-bay, cellitused, craigslist etc and create an ad for your product with details. Within few days you iPhone will be sold.

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