Haven't had most of the issues here myself.
The wallpaper resize may have something to do with how you set your picture as wallpaper. If you long press on an image from the web and a menu comes up giving you the option to set the image as wallpaper the image will be resized to fit your screen. If you copy it to your HDD and set it as wallpaper from there a box will come up that you can drag over the picture and resize. whatever part of the picture is in that box is what will show up as your wallpaper.
Your ram is being used by the system depending on what's running. Anything that's running on you phone either In the background or foreground is gonna use a portion of ram.
You'd have to be more specific on what random wifi problems you're having.
Try deleting the pic and see what happens. Maybe you accidently took a screen shot or something.
Just tried to turn off all animations and the only animation is turns off is the one where you go into your app drawer from your desktop. So there is an issue there. Wouldn't know how to fix it. Could be a phone problem or an OS problem.
My wifi signal did the same thing when I had my connect. While it is weird, if you know your router isn't working than obviously you're not gonna have access to the Internet. Fix your access point and you'll be golden.
I did my best.
when it comes to choosing the best service one must remember: location location location!!!