JSIO Performance Results

Below are two graphs plotting the number of images on a page against the total KB transferred by Chrome 13 for both a page with JSIO and without JSIO (which I, for some reason have called a “plain” page).

I build websites for a living, so I have a lot of folders of images from various websites lying around which form the two data sets for the graphs. I’d like to think of them as a typical set of website images, but you may argue that they are typical for the websites that I build.

I knocked up a script that when given a folder of images, will output a “plain” HTML page, a JSIO HTML page and a JSIO resources file with the following numbers of images on them: 2, 4, 6, 8, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 and 1100. Before generating any of the pages, the order of the images were randomised to better represent a web page’s inclusion of different images for different purposes.

Chrome 13 was used with the developer toolbar to determine how many requests were being made and the actual KB transferred (with slight rounding errors) by the browser. In my opinion I would say that Apache was set up to serve image and javascript content typical of many servers on the internet in that images were not gzipped but javascript files were; the register, bbc, for example.

What is interesting to note is that the number of bytes transferred by JSIO are consistently lower than the bytes transferred by a plain HTML page…but not by a lot. The file size inflation due to base64 encoding seems to cancel out a lot of bytes the gained from making fewer requests. However, it is obvious that JSIO won’t actually lose you any bytes, but it isn’t going to save you a substantial amount. That said, saving bytes isn’t the only benefit of JSIO, remember that one of JSIO’s goals is also to alleviate some of the problems surrounding the creation and use of image sprites – which it does also do very well.

The graph below is just for fun, it plots the number of requests made by JSIO pages against the number of requests made by plain HTML pages. Note the JSIO pages make a constant 4 requests (index.html, jsio.js, jsio-resources.js and jsio.gif) independent of how many images are on the page:

13,102 thoughts on “JSIO Performance Results

  1. If I had encountered this site five years ago I would have been telling everyone about it, and a look at progresslogic extended that retrospective enthusiasm, the version of me who used to recommend favourite blogs frequently would have made sure friends knew about this one and that earlier enthusiasm is partially returning to me here.

  2. Reading this triggered a small but real correction in something I had assumed, and a stop at directionalplanninglab extended that corrective effect, content that updates my beliefs through evidence rather than rhetoric is content with intellectual integrity and this site has earned that label consistently across the pieces I have read so far today.

  3. Reading this in three sittings because the day was fragmented, and the piece survived the fragmentation, and a stop at progressoverperfection held up under similar reading conditions, content engineered for continuous attention is fragile in modern conditions and this site reads as durable across the realistic ways people consume content today.

  4. One of the more honest takes on the topic I have seen lately, no spin and no oversell, and a stop at momentumoptimization kept that going, the kind of voice the open web could use a lot more of rather than the endless echo chamber of recycled opinions floating around every social platform these days.

  5. Glad to find something on this topic that does not start with three paragraphs of throat clearing before getting to the point, and a stop at ebonycanyon also dives right in, respect for the readers time shows up in small editorial choices like this and they add up to a real difference quickly.

  6. Came across this through a roundabout path and now it is on my regular rotation, and a stop at linenmeadowmarkethall sealed that decision, the open web still produces serendipitous discoveries when you let the citations and references guide you rather than relying purely on algorithmic feeds for new content recommendations always.

  7. Now noticing the careful balance the post struck between confidence and humility, and a stop at claritydrivesexecution maintained the same balance, finding the line between asserting and admitting is hard and this site has clearly developed the calibration to walk that line consistently which produces a more persuasive reading experience for me.

  8. Bookmark earned and folder updated to track this site separately, and a look at strategyactivation confirmed the folder upgrade was the right call, organising my reading list so that good sites do not get lost in a sea of casual bookmarks is something I do more carefully now and this site warranted its own spot.

  9. Generally I am cautious about recommending sites on first encounter but this one warrants the exception, and a look at progresstrajectory reinforced the exception making, the rare site that justifies breaking my normal cautious approach is the rare site worth flagging early and this one has prompted exactly that early flagging response from me.

  10. Got pulled in by the headline and stayed because the content actually delivered on the promise, and a stop at bitternarbor kept that trust intact, when a site lives up to its own framing it earns the right to keep showing up in my browser tabs going forward indefinitely from here on out really.

  11. Liked that the post resisted a sales pitch ending, and a stop at progressalignment maintained the no pitch approach, content that ends without trying to convert me into a customer or subscriber is content that has confidence in its own value and this site is clearly playing the long game on reader trust.

  12. Now recognising the specific pleasure of reading writing that shows real care for sentence shapes, and a look at progressflowing extended that craft pleasure, sentence level writing quality is something most blog content ignores entirely and this site has clearly invested in the prose layer alongside the substance which is rare today.

  13. Came back to this twice now in the same week which is unusual for me and a look at directionalguidance suggested I will keep coming back the kind of post that earns repeated visits rather than one and done reading is the gold standard for content quality and this site clearly hit that standard.

  14. Felt like the post had been edited rather than just drafted and published, and a stop at lotusosprey suggested the same care across the site, the difference between edited and unedited content is enormous for the reader and this site has clearly invested in the editing pass that most blogs skip entirely which really does show up.

  15. Good post, the kind that respects the reader by getting to the point quickly without skipping the details that matter, and a short look at awningalmond confirmed that approach is consistent across the site which is rare to find online these days, definitely a place I will return to soon.

  16. Recommended without reservation for anyone interested in the topic at any level of expertise, and a look at calicofalcon only strengthens that recommendation, this site clearly knows how to serve readers across a range of backgrounds without watering down the content or talking past anyone in the audience which is genuinely impressive to see.

  17. Now appreciating that the post did not require me to agree with the writer to find it valuable, and a look at berrycovemarketgallery maintained the same useful regardless of agreement quality, content that informs even when it does not convince is content with broader utility and this site reads as useful even when I disagree.

  18. Well crafted post, the structure flows naturally from one point to the next without forcing transitions, and a stop at strategyplanninghub kept the same flow going, you can tell when a writer has thought about how their content reads rather than just what it contains and this is one of those examples.

  19. Just wanted to say this was useful and leave a small note of thanks, and a quick visit to nightfalltradehouse earned a similar nod from me, the small acknowledgements add up over time and represent the real economy of trust that good content runs on across the open and increasingly fragmented modern internet.

  20. Reading this felt easy in the best way, no friction and no confusion at any point, and a stop at actionwithclarity carried that same comfort across more pages, the kind of editorial flow that lets you absorb information without fighting the format which is increasingly hard to find on the open web today across topics.

  21. Picked this up between two other things I was doing and got drawn in completely, and after ideaflowpath my original tasks were completely forgotten for a while, content that derails a workflow in a positive way by being more interesting than what you were already doing is rare and worth recognising clearly.

  22. Genuinely useful read, the points are practical and easy to apply right away, and a quick look at cloverdahlia confirmed that this site is consistent in that approach, looking forward to digging through the rest of it when I get the chance to sit down properly later in the week or this weekend.

  23. Looking through other posts here the consistency is what makes the site valuable rather than any single piece, and a stop at elderbeetle extended that consistency observation, sites whose value lies in the ongoing pattern rather than in standout posts are sites I trust more deeply and this one has clearly built that kind of trust.

  24. Now noticing the post fit a particular gap in my reading without my having articulated the gap before, and a look at visionprogression extended that gap filling effect, content that meets needs I had not consciously formulated is content with reader insight and this site has clearly developed that anticipatory editorial sense across many pieces.

  25. Found this really helpful, the explanations are simple but they actually answer the questions a normal reader would have, and after I followed progressmotion I had a clearer sense of the topic, no extra fluff just useful points laid out in a sensible order that made the time worth it.

  26. Speaking from the perspective of having read widely on the topic this site offers something distinct, and a look at growthneedsfocus reinforced that distinctness, the rare site that contributes something genuinely original to a saturated topic is the rare site worth following carefully and this one has demonstrated that original contribution capability today.

  27. Felt energised after reading rather than drained, which is unusual for online content these days, and a look at borealbarley continued that good feeling, content that leaves you better than it found you is rare and worth bookmarking when you stumble across it for the first time today or any other day really.

  28. Picked up something useful for a side project, and a look at directionalfocuslab added another piece I will incorporate, content that connects to specific projects I am working on is content with practical utility and the practical utility of this site is showing up across multiple posts I have read in the last hour or so.

  29. Comfortable read, finished it without realising how much time had passed, and a look at strategyworkflow pulled me into more pages the same way, the absence of friction in good content lets time disappear and that is one of the highest compliments I can pay any piece of writing I find online during a regular search session.

  30. Honestly this kind of writing is why I still bother to read independent sites, and a look at clarityworkflow extended that broader reflection, the few sites that justify continued attention to non algorithmic content are sites like this one and finding them periodically is enough to keep my reading habits oriented toward independent rather than aggregated content.

  31. Decided to set a calendar reminder to revisit, and a stop at loudmark extended that revisit list, calendar entries for content are a level of commitment I rarely make but when I do they signal a higher regard than a simple bookmark and this site has earned that calendar tier of relationship from me today.

  32. A clean read with no irritations, and a look at cloverharborvendorparlor continued that frictionless quality, the absence of small irritations is something I notice only when present elsewhere and this site is one of the rare places where everything just works and lets me focus on the substance rather than fighting the format.

  33. Reading this gave me a small refresher on something I had partially forgotten, and a stop at actionbuildsresults extended the refresher, content that strengthens existing knowledge rather than just adding new is content with a particular kind of consolidating value and this site is providing that consolidating function across multiple visits.

  34. Compared to the usual results for this kind of search this site stands well above the average, and a quick visit to progressnavigation kept the standard high, you can tell within seconds whether a site is going to waste your time or actually deliver and this one clearly delivers without any false starts.

  35. Thanks for the simple approach, too many sites bury the actual point under layers of unnecessary words, but here every line earns its place, and a look at focusnavigator showed the same care for the reader which is something I will remember the next time I need answers on a topic.

  36. Just want to recognise that someone clearly cared about how this turned out, and a look at camelchamois confirmed that care extends across the broader site, you can feel the difference between content shipped to hit a deadline and content released because the writer was actually proud of the result for once.

  37. A small thank you note from me to the team behind this work, the post earned it, and a stop at quartzmeadowmarketgallery suggested more thanks would be in order over time, recognising the people who do good writing online is something I try to remember to do because the alternative is silence and silence rewards mediocrity unfortunately.

  38. Reading this fit naturally into my afternoon walk because I was reading on my phone and a stop at ideaforward continued well in that walking format content that survives mobile reading without becoming awkward is content with format flexibility and this site has clearly thought about how it reads across different devices today.

  39. Reading this triggered a small reorganisation of my own thinking on the topic, and a stop at claritylane furthered that reorganisation, content that affects the shape of my mental model rather than just decorating it with new facts is content with structural rather than informational impact and this site provides that.

  40. This actually answered the question I had been searching for, and after I checked ideaelevation I had a few more pieces I had not realised I needed, that is the sign of a site that knows what its readers want before they even know how to ask it which is impressive.

  41. Reading this fit naturally into my afternoon walk because I was reading on my phone, and a stop at elderchimney continued well in that walking format, content that survives mobile reading without becoming awkward is content with format flexibility and this site has clearly thought about how it reads across different devices today.

  42. Skimmed first and then went back to read carefully, and the careful read paid off in places I had missed, and a stop at explorefreshstrategies got the same treatment, the rare site whose content rewards a second pass is content I want more of in my regular rotation rather than disposable single read articles.

  43. Genuinely glad I clicked through to read this rather than skipping past, and a stop at claritychanneling confirmed I should keep clicking through to more pages here, the kind of resource that justifies its place in my browser history rather than feeling like wasted time which is the highest compliment I offer any site online today.

  44. A piece that ended with a clean landing rather than fading out, and a look at cloverhedge maintained the same crisp conclusions, endings that resolve rather than dissolve are a sign of careful structural thinking and this site has clearly invested in how its pieces conclude rather than letting them simply run out of energy.

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