Re: trouble with SVG background image

On Fri, Jul 20, 2018 at 8:25 AM Levi Morrison <morrison.levi@gmail.com> wrote: > > On Fri, Jul 20, 2018 at 7:15 AM Jim Nagel <jim@archivemag.co.uk> wrote: > > > > Hi. I'm a novice at PHP, so I frequently need to refer to your online > > manual at www.php.net > > > > Unfortunately on my non-mainstream browser -- Netsurf, running on > > RiscOS -- the pages at PHP.net are sooooo paiiiiinfully slooooow to > > render. If the page is lengthy, it takes ages to scroll. > > > > Curious, I asked the Netsurf developers what mechanism might be > > causing the unusual sluggishness. > > > > They investigated and replied: > > > > It's because of this SVG being used as a tiled background on > > the HTML element: > > http://php.net/images/bg-texture-00.svg > > > > Since it's an SVG it bypasses all the optimisations we have > > [in Netsurf] for tiled bitmap redraw. > > > > It also isn't a filled rectangle, it's just strokes, so it > > doesn't get "knocked out" by our normal rendering > > optimisations. > > > > Finally it uses opacity, which wouldn't help either, > > although I think we ignore that anyway for now. > > > > It could potentially be optimised by pre-rendering it once > > to a bitmap, but it would be a fair amount of effort for > > what is a pretty uncommon case. > > > > For now, I'd try just toggling background images off in the > > menu for that window, and forcing a redraw. > > > > That final suggestion works here, sort-of, but has to be applied again > > and again. > > > > I tried viewing the PHP.net pages from Firefox and Chrome on Windows > > and Android devices. Must admit that your background, if it displays > > at all, is hard to notice! Is my eyesight missing something? > > > > Dare I suggest to the PHP.net webmasters that you simply dispense with > > the SVG background? Is it really worth while? > > > > Thanks for listening. Best wishes from this niche. (And I am > > enjoying my forays into PHP.) > > > > -- > > Jim Nagel www.archivemag.co.uk > > Abbey Press 32 Norbins Rd (01458) 83 3603 > > Glastonbury BA6 9JG pocket 0797 415 3861 > > > > -- > > PHP Webmaster List Mailing List (http://www.php.net/) > > To unsubscribe, visit: http://www.php.net/unsub.php > > We can probably remove it. I'm curious what about it is really so > slow, though. Opacity is used all over the place, and SVGs have been > increasingly more popular. Would making the image larger have any > effect? I'm wondering if repeating the image is causing issues because > it is so small. For instance, would this SVG perform any differently? <svg xmlns="http://www.w3.org/2000/svg" width="8" height="8"> <path fill="none" xmlns="http://www.w3.org/2000/svg" style="stroke:#000;stroke-width:.5;stroke-opacity:.25" d="M 4,0 0,4 4,8 8,4 Z M 0,0 8,8 M 8,0 0,8" /> </svg>