So I attempted to determine the accuracy of this claim. I ran a benchmark from Kevin Roast [1] who seems to author a lot of Canvas demos. For each of the 8 tests in his benchmark, I recorded the FPS reading that I saw that was the lowest (e.g., framerate dropped to X at some point during the 5-second test).
Mac iPad
20fps 16fps
29fps 18fps
30fps 21fps
30fps 30fps
28fps 6fps
29fps 18fps
29fps 7fps
12fps 30fps
mean_mac = 25.875, median_mac = 29 mean_ipad = 18.25, median_ipad = 18
On the Mac side, I can see both sides of the issue. Arguably 26-29fps in a wide variety of situations is good enough for a wide variety of applications. At the same time, I can understand the author really wanting to blow past 29fps.
On the iPad side, the issue is more clear. I think most people would say that 18fps is unacceptable for a drawing application.
(If these numbers are contributing to the "pseudo-myth" of slow Canvas performance, please point me to a reasonable benchmark. This one is just the most comprehensive one that I found.)
> At the risk of being a bit rude, it's worth noting that he doesn't bother with all Desktops, just Mac, which causes further suspicion that this is really just a rationalization piece and not about performance.
He addresses the choice of the Mac platform in some detail in the "Drawbacks" and "Conclusions" section of the post. At the risk of being a bit rude, it's poor form to dismiss someone's reasoning as a "rationalization" without addressing the reasoning on the merits. To the extent that his choice of Mac over Windows et al is specious, it is not a claim that is supported by your comment.