It's perfectly ok to dislike iOS 7. No one said you should be forced to love it.
What I find the most suspicious is that when people do vent about iOS 7 they provide details as to what they don't like which confirms they have actually used it.
The OP here is just saying "I hate it" and then providing a free memory screenshot?
Unless proven otherwise I do not think the OP even has a iPhone.
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You may be correct but all these years I've used an iPhone 3G, 3GS, 4S, 5 I've never run into a moment where the springboard was slow to react or apps were slow to open.
One thing I noticed that when you pull down from home screen to get spotlight search, all my iDevice (iPhone 4S, iPad mini, iPad 3) all lags a bit. You can fell the lag.
Springboard never slow down and app really opens. But when there isn't enough memory, iOS will kill all background activities. That means, when you reopen background app, the app will need refreash itself, that leads to slow opening. The best example is Safari when page refreshes itself after runing in background for a while.