![]() Outbrain is forcing layout repeatedly, probably in a The basic idea is that all of those methods will ensure they give the correct values. Read your metrics at the begininng of the frame (very very start of rAF, scroll handler, etc), when the numbers are still identical to the last time layout was done. Batch your writes & reads to the DOM (via FastDOM or a virtual DOM implementation).You may be surprised to see how often your app code and library code hits this. Use DevTools Performance Panel to see where this happens.for loops that force layout & change the DOM are the worst, avoid them.What should you do about all this? Well, the More on forced layout section below covers everything in more detail, but the short version is:.Their costs are very dependent on the content/situation, but typically both operations are similar in cost. So forced layout triggers both operations. If layout is forced, style must be recalculated first.Typically, this is because the DOM was changed (classes modified, nodes added/removed, even adding a psuedo-class like :focus). Reflow only has a cost if the document has changed and invalidated the style or layout.These items were previously in the list but appear to not be any longer (as of Feb 2018): motion-path, motion-offset, motion-rotation, x, y, rx, ry.grid, grid-template, grid-template-columns, grid-template-rows. ![]() transform, transform-origin, perspective-origin.The property requested is one of the following: ( source).device-pixel-ratio, resolution, orientation, min-device-pixel-ratio, max-device-pixel-ratio. ![]()
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