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Hi everyone, I wanted to reply this post -> http://greensock.com/css-performance But I don't know why I can't leave a message, even if I'm logged in... So I'll share my opinion here I'm working on a game webapp (HTML5/CSS/JS), running on desktop browsers, smartphone, tablet and also into a native IOS app (webview) built with Cordova. In this webapp, like in every games, there is of course transitions between pages, popup and dialog apparition, drag and drop functions, etc... there is also transitions/animations on elements such as div, svg, png from the DOM during the game. During my development process, I was looking for the best way to animate those elements to get the best visual effect during transitions, tween, bouncing effect, apparition effect, etc. I was focusing on this idea "the user should NOT see the difference between my webapp and a real native app". I wanted every transitions/animations look smooth and great. I know GSAP since 2010 so this was my first idea. GSAP is really the most convenient JS library that I know to animate. I have nothing to say on that point. But, during my test on different devices, I noticed that large transitions such as fade on the entire screen, dialog and popup bouncing, opacity apparition was laggy on smartphone and tablet (on desktop browser it was great). So I did some research and test. After reading lot of post about CSS vs JS I tried by myself to recode all those laggy transitions only with CSS rules. The result was surprising because those new transitions was great, no lag, very fluid, better than with GSAP. Then I found this article -> http://greensock.com/css-performance I tried the CodePen linked -> http://codepen.io/GreenSock/full/2a53bbbcd47df627f25ed1b74beb407d/ On my laptop I can't see any difference (I'm not talking about pure performance and FPS benchmark, I'm only talking about visual feeling, looking for something fluid, without lag). But did you try this CodePen on tablet and smartphone? The difference is huge. CSS transitions look really better, fluid without any lag during transition. I did test on iPad Pro, iPad Air, iPad 3, iPhone 5, iPhone 6... Each times I set the Quantity at 2000 and I can see a huge difference. CSS looks much better. Of course coding complex animation with pure CSS rules is awful, so if I could get the same result with GSAP I'll use it for sure. And you guys? Did you encountered the same issue with smartphone and tablet? Any opinion or comment are welcome! Thanks!
How can I test the performance of the visitor's device on page load? So that if it does <20 FPS I can skip animations altogether I didn't find anything like this in the documentation