Cooking time and Barometric (Air) pressure/Altitude

How would the timings of advanced cooking be affected by altitude or elevation above Sea level.?
I remember when I was living in Johannesburg South Africa 1,753 meters (5,751 ft) above sea level Water boiled at 94 C 

The higher you go the lower the boiling temperature. 


If this is a factor, is there any compensation that would need to be made in cooking time or the addition of (Salt?) to increase the boiling point?


I found this article:

http://www.wonderquest.com/kangaroo-pouch-everest-egg.htm

and it seems that they (in a roundabout way) were cooking Souvide however this did not answer the set Temperature at altitude Question

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