parallax.js causes lags while scrolling page - javascript

I have a problem on website where I'm using parallax.js ( matthew.wagerfield.com/parallax/ ). While scrolling page down to section where parallax.js appear it causes huge lags. Firefox doesn't have this problem.
Here is a screen from Chrome timeline:
http://i.stack.imgur.com/J77Tm.jpg
An example here
I'm sure that size of images doesn't matter because it happen even on 5kB images.

Related

Website background images flicker on Firefox

We have a website whose background is a stack of images through which we go with JavaScript.
We check whether the next image is loaded before switching to it, and it works fine on Chrome, Safari, IE, and all mobile browsers, however on Firefox we sometimes get a white flash.
This problem also happens if we make sure that all the images are preloaded so it's not a problem that FF shows the image before it has finished loading. I've seen the question asked elsewhere but from the user's perspective, and the solution was to disable hardware graphics acceleration, which does not solve completely the problem but reduces it. However we obviously can't ask that from our users.
Similar problems were reported in other questions:
jquery animate (height) causes background-image flickering in firefox
Image Flickering only in Firefox
Firefox background image flickering when using multiple instances and background-size
skrollr background image flicker in Firefox
However none has a clear solution. Does anyone know how to correct for this?
Cheers!

Working to get scrolling on mobile devices, works on desktops. Using fullPage.js

I'm working on a some-what basic site, but have an issue we can't seem to get passed. (site not complete)
It's a horizontal size, laid out using fullPage.js.
https://github.com/alvarotrigo/fullPage.js/
When you click the Sign up button in the top right corner, the slide container scrolls all the way left, displaying an iframe, loaded with a CRM.
We're using a callback in the fullPage plugin to know when a user has scrolled to that page. When the page with the iframe is loaded, a script runs to resize the height of the iframe to the available screen-estate ( win height - header & footer ).
Problem is, scrolling doesn't work on Iphone. Works fine on desktop.
Can't seem to figure out what's going on. Have read up on scrolling in iframes on iOS devices, but haven't stumbled upon a viable solution.
url: go-combine.com
Thank you in advance for your help.

Issues Creating Image Sequence Animation in IE11

I'm using Skrollr.js to animate an image sequence. I took inspiration from how the http://moto.oakley.com site handles image sequences, and built some scripts to help me automate writing a series of images into the DOM. Then, I use Skrollr to change the display:none; to display:block at key scroll positions. My script preloads all the images before dispatching a complete event, and then I initialize Skrollr and allow interaction.
So, basically I have a <div> containing that has a bunch of these:
<img src="seq-000.png" data-0-top="display:block;" data-50-top="display:none;">
<img src="seq-001.png" data-0-top="display:none;" data-50-top="display:block;" data-100-top="display:none;">
<img src="seq-002.png" data-50-top="display:none;" data-100-top="display:block;" data-150-top="display:none;">
...
Now, this is working just fine in Chrome and FireFox (naturally), but Internet Explorer 11 seems to have problems rendering the images during the first scroll through the page. In other words, when I first load the page and scroll the images blink into place like they have not be preloaded, but subsequent scrolls the animation is perfectly fine. It's like IE11 hasn't rendered the images into memory, so the draw speed to the screen has a delay the first time any image is displayed.
I don't think Skrollr is the problem. Perhaps there's some magic CSS setting I should using.
Does anybody have any tips for making image sequences so they look ultra smooth everytime even in Internet Explorer?!?
Thanks!

Jerky slideshow transition of scaled images in Safari

Please have a look at this: http://www.eymy.nl
The transition works smoothly in all browsers, but becomes jerky in Safari when the images are scaled down (when the window height is smaller than 1227 pixels, which is the 100% height of the images). In other words, Safari cannot handle this transition together with scaling.
My guess is that it CAN, but needs different code. I tried different slideshow scripts and the results are always the same, the moment the images are scaled (down OR up) the transition in Safari becomes jerky.
Any advice will be greatly appreciated!
I'm using Chrome and Safari on a i7 MacBook Air and it was smoother in chrome. After the first image loaded in Safari which was choppy it looked OK. Since this seems like an issue of images loading before they are animated I would suggest preloading them. This is usually done in the body tag with JavaScript or you can also use CSS. See this page for ways to preload images.

Skrollr iOS issues

I'm having issues with a parallax site I am building using Skrollr.
I've built a site that has the same effect as https://www.spotify.com/uk/. The effect being large full width background images that move slower than the natural browser scroll, and have text and other images moving on top of them.
When viewed on a desktop browser the site functions fine and performs perfectly. The problem I'm having is when testing on an iPad (iOS 6.1.3) and you release your finger from the screen and Skrollr's intertia animation takes over, the large background images and other content on the screen start to jitter and jump on the screen. This does not happen when you still have your finger touching the screen and scroll, only when you let go and the easing takes over.
A couple of things I've tried are:
Setting webkit-backface-visibility:hidden on all of the background images, and skrollr-body div.
Animate elements using –webkit transition: translate3d
If anyone could shed any light on why I'm getting this page flickering issue that would be great.
I had a very similar issue (i.e. Skrollr / iOS parallax background image 'flicker'). I believe you'll find it's related to this: cubiq.org/you-shall-not-flicker
Simple solution (from the article): -webkit-transform:translate3d(0,0,0).

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