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posted by janrinok on Thursday February 22 2018, @10:49PM   Printer-friendly
from the choose-wisely dept.

Both Facebook and Netflix implemented their eponymous apps with Web. Despite spending millions of dollars, neither of them could achieve an iPhone-like user experience (60 frames per second and less than 100ms response to user inputs) on anything less powerful than a system-on-chip (SoC) with four ARM Cortex-A9 cores.

In contrast, numerous products like infotainment systems, in-flight entertainment systems, harvester terminals and home appliances prove that you can achieve an iPhone-like user experience (UX) on single-core Cortex-A8 SoCs. Our above-mentioned manufacturer HAM Inc. (renamed for the sake of confidentiality) verified these results by building both a Web and Qt prototype.

In this white paper, Burkhard Stubert explains how he could save one of the world's largest home appliance manufacturers millions of Euros by choosing Qt over HTML. The secret? Qt scales down to lower-end hardware a lot better, without sacrificing user experience.

With a five times smaller footprint, four to eight times lower RAM requirements and a more efficient rendering flow than HTML, Qt provides faster start-up times and maintains the cherished 60fps and 100ms response time, where HTML would struggle. The calculations show that being able to just downgrade your SoC by just one tier like this, Qt can reduce your hardware costs by over 53%.


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  • (Score: 3, Interesting) by FatPhil on Friday February 23 2018, @04:46AM

    by FatPhil (863) <reversethis-{if.fdsa} {ta} {tnelyos-cp}> on Friday February 23 2018, @04:46AM (#642224) Homepage
    UI latency is one of those things that users do care about, they just don't know it until the encounter something that's different. There are thresholds above which users get very pissed off with the lag - they take several belaboured attempts to try to get things as they want, and they'll openly complain about it. Flipside - there's a threshold below which users feel that they're actually interacting with a real object rather than the rendering of something that moved in response to an earlier movement of their finger. Users adore this - as it takes away the instantanious "what's it going to do, will it move or not?" concern that they subconsciously have. (That's under 30ms typically, the 100ms threshold in the story is well in the realm of the will-it-won't-it worry.)
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