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The screen keyboard is a bit difficult, but I think it is the fault of the display. I can tip the keys very fast, reaching somehow half the speed of the input with computer keyboards. However, the alphabets are just coming to the screen very slowly after I tipped lots of words, together with a bit flashing.
It seems that the delay between two 'screen draw event' is really large, a few hundreds ms. When I tip one alphabet, this alphabet is first darkened, and then whitened again, and then a suggestive word is refreshed and finally the alphabets is displayed in the input region. So totally 4 'screen draw event' makes the input quite 'unresponsive'. Perhaps SONY can simply ignore the darken and whiten of the alphabets, the screen keyboard would be easier to use.
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