![]() One way to make sure that updates stay as slim as possible is to build and submit the app frequently to the app stores so that users can download a new app binary that includes more up-to-date assets. It will not re-download unchanged assets that already exist inside the app. It's important to point out that a user's app will only download new or updated assets. ![]() Modern video codecs can produce smaller file sizes by over an order of magnitude.) Further considerations (Note: GIFs are a very inefficient format. It's quite common for an optimized image that is over 95% similar to the original image to be far less than 95% of the original file size! Other assetsįor assets like GIFs or movies, or non-code and non-image assets, it's up to the developer to optimize and minify those assets. Tools like imagemagick can use comparison algorithms like SSIM to give a sense of how similar two images look. Often, lossy optimizers are more efficient because they discard visual information that reduces file size while making the image look nearly the same to humans. Other image optimizers are lossy, which means the optimized image is different than the original image. When you need each pixel to be untouched from the original image, a lossless optimizer and a lossless image format like PNG is a good choice. This means they re-encode your image to be smaller without any change, or loss, in the pixels that are displayed. There are also many online services that can optimize your images for you. imagemin is another program and JS library that supports plugins for various optimizers. You can compress images using tools such as guetzli, pngcrush, or optipng. To see a pretty-printed list of assets, we can run: The assets there are hashed with their extensions removed, so it is difficult to know what assets are there. You can view all the assets uploaded to EAS' servers in. Users will have to download any new images or other assets when they detect a new update, if those assets are not already a part of their build. Making these file sizes as small as possible helps end-users download updates quickly. Nevertheless, these files will be downloaded to a user's device when getting the new update if the device has not downloaded them before. Note that these are uncompressed file sizes EAS Update uses Brotli and gzip compression, which can significantly reduce download sizes. dist/bundles, we can see the size of the and files that will be part of the iOS and Android updates, respectively. When publishing an update, EAS CLI runs Expo CLI to bundle the project into an update. Many users running Android and iOS apps are using mobile connections that are not as consistent or fast as when they are using Wi-Fi, so it's important that the assets shipped as a part of an update are as small as possible.
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