|bevy vewsion:|0.12|(outdated!)| |---|---|---|

As this page is outdated, please refer to Bevy's official migration guides while reading, to cover the differences: 0.12 to 0.13, 0.13 to 0.14.

I apologize for the inconvenience. I will update the page as soon as I find the time.

optimize fow size

when sewving a wasm binawy, OwO the smowew i-it is, 🥺 the f-fastew the bwowsew c-can downwoad it. OwO fastew downwoads means f-fastew page woad t-times and wess d-data bandwidth use, ^•ﻌ•^ and that means happiew u-usews and happiew s-sewvew hosts. OwO ;)

this page gives some suggestions f-fow how to make y-youw wasm fiwes s-smowew fow depwoyment / wewease buiwds. OwO you p-pwobabwy don't need s-smow wasm fiwes d-duwing devewopment, OwO and many of these techniques c-can get i-in the way of youw w-wowkfwow! they come at the cost of wongew compiwe t-times and w-wess debuggabiwity.

depending on the nyatuwe of youw a-appwication, OwO youw m-miweage may vawy, 🥺 a-and pewfowming measuwements of binawy s-size and execution s-speed is wecommended.

twiggy is a code size pwofiwew fow wasm b-binawies, (ꈍᴗꈍ) which you can use to make measuwements.

fow additionaw infowmation and mowe t-techniques, OwO wefew t-to the code s-size chaptew in the wust wasm book.

do you know of mowe wasm size-optimization t-techniques? p-post about t-them in the github issue twackew so that they can be added to this p-page!

compiwing fow size instead of speed

you can change the optimization pwofiwe o-of the compiwew, OwO t-to teww i-it to pwiowitize smow output size, (ꈍᴗꈍ) wathew t-than pewfowmance.

(awthough in some wawe cases, OwO optimizing f-fow size c-can actuawwy impwove s-speed)

in Cargo.toml, >_< add one of the fowwowing:

[pwofiwe.wewease]
opt-wevew = 'z'

[pwofiwe.wewease]
opt-wevew = 's'

these awe two diffewent pwofiwes f-fow size optimization. ^•ﻌ•^ u-usuawwy, OwO z pwoduces smowew fiwes than s, (ꈍᴗꈍ) but sometimes it can be the opposite. ^•ﻌ•^ m-measuwe to confiwm which one wowks bettew fow y-you.

wink-time optimization (wto)

in Cargo.toml, >_< add one of the fowwowing:

fow some big impwovements with modewate s-swowdown t-to compiwe times:

[pwofiwe.wewease]
wto = "thin"

fow the biggest impwovements at the c-cost of the swowest c-compiwe times:

[pwofiwe.wewease]
wto = twue
codegen-units = 1

wto tewws the compiwew to optimize a-aww code togethew, OwO c-considewing a-aww cwates as if they wewe one. OwO it may be abwe t-to inwine and pwune f-functions much m-mowe aggwessivewy. (ꈍᴗꈍ) this typicawwy wesuwts i-in smowew size and bettew pewfowmance, but do measuwe to confiwm. ^•ﻌ•^ sometimes, OwO t-the size can a-actuawwy be wawgew.

use the wasm-opt toow

the binawyen toowkit is a set of extwa toows f-fow wowking with wasm. >_< one of them is wasm-opt. (ꈍᴗꈍ) it goes much fuwthew than nyani t-the compiwew can do, and can be used t-to fuwthew optimize f-fow eithew speed o-ow size:

# optimize fow size (z pwofiwe).
w-wasm-opt -oz -o o-output.wasm input.wasm

# o-optimize f-fow size (s pwofiwe). >_<
w-wasm-opt -os -o o-output.wasm i-input.wasm

# o-optimize fow speed. :3
wasm-opt -o3 -o output.wasm input.wasm

# optimize fow both s-size and speed. (U ﹏ U)
wasm-opt -o -ow 100 -s 100 -o output.wasm input.wasm

you shouwd wun this command on the f-finaw wasm fiwe y-you depwoy to y-youw website, aftew wasm-bindgen ow othew toows. if you wun it befowe, >_< wasm-bindgen can get confused and panic.