Why is my Wi-Fi very slow after ios 7 update?

My Wi-Fi speed has gone right down after updating to ios 7.
The speed is still good on my other devices, but very slow on my iPhone 4s with iOS 7!

U installed a virus

LOL iios 7 is a scam.iphone4 was the last good iphone

Newer version update, makes it slower cause it needs more internet

Never, ever install the latest and greatest until it's been out for a few months, (6-12) there are always problems and this one is a known problem.
Give it a month or three and they'll get it fixed.

Because apple is meant for girls or beginners.

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