2) put Nova as a shortcut on lock screen deluxe tab, and then chose Whitelist deluxe tab. All the app on shortcut will be put on memory. My nova never close again with this. You can chose other lock screen after if you want.
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Thanks for the tip, however the lag is still there, especially when browsing with Chrome for a while then hitting home. Wallpaper appears but icons take approx. 1.5 seconds to show up.