When Natalya runs towards the first computer, keep her in sight at all times. You can't gain any time from looking away and then reloading her after a while. In fact, you can lose over 200 frames doing this (if badly timed).
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Don't look straight down as Natalya approaches first computer. Again, you can't gain any time this way and if you look down before Natalya starts walking = Instant 50-60 frames lost.
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So basicly, always look at Natalya while she's moving.