The way Android works, it will always want to fill up free RAM with processes so that they're more quickly accessible when you need them. In general, RAM will optimally be used at around 70-80%. I'm not a total Android techie, so I can't give you the down and dirty details, but in short, when the system detects that it's crossed a certain threshold of RAM usage, it will start shutting down less recently used processes to free up more RAM. 400 MB out of 812 MB RAM used is pretty low, and would not be how things are supposed to work. However, 790 MB out of 812 MB RAM used is pretty high, so that could explain why your phone's been acting a little loopy.
If things keep bogging down even after a restart, I would suspect one of your apps misbehaving. When your memory usage is up around 790 MB, take a screenshot of your Running Apps screen under Settings/Apps/Running, so we can see which one the hog is.
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forum.xda-developers.com
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