"During our testing with the 5-minute clip, it took Vimeo an average of 10:34 to encode the video, versus 2:35 for ScreenLight. In other words, it took almost 4 times as long for Vimeo to process videos for viewing." "With the 15-minute test clip, it took Vimeo an average of 21:45 to encode the video versus 7:58 for ScreenLight. This is nearly 3 times as long."Speed isn't the only important factor. Zencoder provided much greater consistency in encoding times.
"Vimeo's processing performance exhibited much more variability than ScreenLight's as is shown by the chart below on standard deviation. The 5-minute clip took between 4:47 and 18:15 to encode with Vimeo, as compared with 1:51 to 3:51 for ScreenLight. The 15-minute clip took between 6:15 and 49:34 to encode with Vimeo, as compared with 3:25 to 18:43 with ScreenLight."