IOS 6 Slows down my iPhone 4 Tremendously?

I upgraded to iOS 6, and I swear it took over 20 seconds to open the camera app, I know because I timed it! Everything is so slow and laggy. Wait that's not true, sometimes it loads at lightning speeds, and other times, with no apps running it still can take 10+ seconds to load. Loading the Appstore or the music app literally take ages, and I noticed loading messages app is much slower, it can lag for as little as 1 second before showing the messages. 1 second doesn't sound like a lot, but it is when it used to load almost instantly… It's just been really slow. So my question is… Will iOS 6 for the iPhone 4 be like how iOS 4 was for the 3G?

It's still a beta. Right now it's only intended to be available to developers so they can start making their apps work with it. There's still a lot of bug fixing and tweaking to be done, it's very likely performance will greatly improve by the time it goes live. There's no way of knowing how the final version will perform on any device. You can't look at a beta and assume its an indication of the final product.

It sounds like youre using one of those leaked ios betas, because honestly a develoer would know betas do not represent the final product. A piece of advice: don't use leaked betas. I know it's tempting to see all these promised features in action, but leaks tend to be buggy at best, at worst they make your device a brick requiring a complete restore (and a few times, they have prevented restores from working).