Does ios 7 slow's down the iphone 4?

I just wanna buy an iphone 4, but i thinks there's an update that have no bugs… Please answer.

Ios7 does slow down the 4. Lets just say, it works smoother on the 5. Because thats what it was made for. I had the 4, and some things like the time it takes to respond after touching the screen is fairly slower. But overall, not much of a difference. But you can tell. Now i have the 5 and ios 7 is smoother.

Yes seems to work a bit slow on iPhone 4, seems i0s 6 should have been the last for iPhone4, but can improve it with some tweaks

IOs 7 is slow in iphone 4