Ok i finally figured out how to fix the delay from switching from portrait to landscape when switching wallpapers. Simply resize the wallpaper to 640 x 640 and it should fix the long delay issue. The thing is that since Psyki's (or any VGA) wallpapers are sized as 480 x 640, every time you would rotate screen, it would have to stretch the wallpaper each time causing the delay. I resized the wallpapers in photoshop losing no quality whatsoever!
Psyki v3 wallpapers resized attached.