> Just did it on my 2011 MacBook Air. Pushes all four cores up... about 15%.
15% of 4 cores ~ 60% single core capacity. That's distinct from saturating a core both qualitatively and quantitatively, which means the prediction is not a bullseye... but it's on the order of magnitude in impact, which means they're not entirely wrong.
Giphy manages to consume a much larger fraction of my modern desktop's CPU. I think it may have something to do with the small size and multiple copies of the gifs on the page you chose.
Ah, yes, I didn't realize that Slack's platform reimplemented the whole graphics-formats-rendering stack. I naively thought that Electron and Slack inherited that from Chromium, but guess stupid me is way behind the times in this technicky stuff. Of course it's all in Javascript now, what was I thinking!
I don't believe these are actually gifs here. Similar to sites like imgur or twitter they convert it to something else to host for other people. Probably to keep bandwidth down. You can get to the actual gif, but you have to dig for it.