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:



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Approaching this with the usual skepticism I bring to new sites and being slowly persuaded, and a stop at wildbrookmodern continued that gradual persuasion, the careful path from skeptical reader to genuine fan is the only one I trust and this site has walked me along that path through patient consistent quality across pieces.
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During a reading session that included several other sources this one stood out, and a look at bluewillowmarket continued the standout quality, the side by side comparison of sources during research is a useful exercise and this site has been winning those comparisons for me consistently across multiple research sessions during the last week.
Came across this looking for something else entirely and ended up reading it through twice, and a look at fleetatelier pulled me deeper into the site than I planned, the writing has a way of holding attention without resorting to manipulative cliffhangers or vague promises that never get delivered later down the page.
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Solid recommendation from me to anyone working in the area, the perspective here is grounded, and a look at wildmeadowstudio adds even more useful angles, the kind of site that becomes a reference rather than just a one time read which is a higher bar than most blogs ever reach today on the modern web.
Yesterday I was complaining about the state of online writing and today this site has temporarily fixed that complaint, and a look at softforestfabrics extended that mood reversal, the short term mood improvement that comes from finding good content is real and this site has produced that improvement for me at a useful moment.
Now wishing more sites covered topics with this level of care and a look at globehaven extended that wish across more subjects the rarity of careful coverage on most topics is a problem and this site is one of the small antidotes to that broader pattern of casual or surface treatment of complex subjects.
Came back to this twice now in the same week which is unusual for me, and a look at jetmanor 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.
The post made the topic feel approachable without making it feel trivial, that is a fine balance, and a stop at candidmeadow maintained the same balance, finding the middle ground between welcoming and serious is genuinely difficult and the writers here have clearly figured out how to consistently hit it well across many different posts.
Most posts I read end up forgotten within a day but this one is sticking, and a look at wildspireemporium extended that lingering effect, content that survives the immediate moment of reading rather than evaporating is content with genuine retention quality and this site has been producing memorable pieces at a rate notable across my reading.
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Genuinely changed how I think about a small piece of the topic, which does not happen often online, and a look at uniquebuyoutlet added another nudge in the same direction, the kind of writing that earns a small mental shift rather than just confirming what you already thought before reading is a sign of careful thought.
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Now adding the homepage to my regular check rotation rather than waiting for individual links to find me, and a stop at dreamridgeemporium confirmed the rotation upgrade, the move from passive discovery to active checking is a vote of confidence in a sites ongoing quality and this site has earned that active engagement clearly.
Found a couple of useful angles in here I had not considered before reading carefully, and a quick stop at timelessharveststore added more, this is one of those sites where the value compounds the more you read rather than peaking at one viral post and then offering nothing else of substance afterwards which is common.
Felt the writer respected me as a reader without making a show of doing so, and a look at urbanlegendstore continued that quiet respect, this is the kind of small but meaningful detail that separates the sites I bookmark from the ones I close after a single skim and never return to again no matter how interesting the headline.
Skimmed first and then went back to read carefully, and the careful read paid off in places I had missed, and a stop at larkcliff 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.
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Now wondering how the writers calibrated the level of detail so well, and a stop at noblearena continued the same calibration, the right level of detail is one of the harder editorial calls in any piece and this site has clearly developed an instinct for it through what I assume is years of careful practice publicly.
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Honest assessment after reading this twice is that it holds up under careful attention, and a look at trendandstylecorner extended that durability across more pages, content that survives a second read without revealing weak spots is rarer than the average reader probably realises and this site clearly cleared that bar.
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