Question: Can I tell by looking through the viewfinder? Well, funnily enough, not necessarily! In theory a pentamirror is darker but design improve all the time and a good pentamirror may out perform a bad pentaprism.
Dell Unveils its Lightest, Smallest and Most Power-Efficient Entry-level Thin Client - Wyse 3040 -- Industry's first entry-level Intel x86 quad-core thin client designed for light multitasking in virtual desktop environments -- Designed for efficiency with 30 percent better performance than previous generations -- Robust connectivity options with superb performance and dual high-definition DisplayPort interfaces PR Newswire ROUND ROCK, Texas, March 29, 2017 ROUND ROCK, Texas ...
Worst-case performance: the input is distributed as worst as it could be for an algorithm. Average-case scenario: approximation of the most common arrange of inputs. Best-case scenario: most favorable distribution of the inputs. One more: Space. this is how much space the algorithm cosume to execute.