perf(turbopack): Use Cow::into_owned instead of .to_string()

[kdy1]

What?

Cow::into_owned() does not allocate in some cases, while to_string() always allocate.

Why?

In the name of the performance.

How?

Closes PACK-3793

[kdy1]

• refactor(turbopack): Remove ReadRawVcFuture.turbo_task #75217
• perf(turbopack): Use Cow::into_owned instead of .to_string() #75216 👈 (View in Graphite)
• canary

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[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
buildDuration	18s	15.6s	N/A
buildDurationCached	14.8s	12.3s	N/A
nodeModulesSize	419 MB	419 MB	N/A
nextStartRea..uration (ms)	400ms	397ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
5306-HASH.js gzip	54.1 kB	54 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
8377-HASH.js gzip	5.46 kB	5.46 kB	N/A
bccd1874-HASH.js gzip	52.9 kB	52.9 kB	N/A
framework-HASH.js gzip	57.5 kB	57.5 kB	N/A
main-app-HASH.js gzip	241 B	242 B	N/A
main-HASH.js gzip	34.6 kB	34.6 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	0 B	0 B	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

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_app-HASH.js gzip	193 B	193 B	✓
_error-HASH.js gzip	193 B	193 B	✓
amp-HASH.js gzip	512 B	510 B	N/A
css-HASH.js gzip	343 B	342 B	N/A
dynamic-HASH.js gzip	1.84 kB	1.84 kB	✓
edge-ssr-HASH.js gzip	265 B	265 B	✓
head-HASH.js gzip	363 B	362 B	N/A
hooks-HASH.js gzip	393 B	392 B	N/A
image-HASH.js gzip	4.59 kB	4.58 kB	N/A
index-HASH.js gzip	268 B	268 B	✓
link-HASH.js gzip	2.35 kB	2.35 kB	N/A
routerDirect..HASH.js gzip	328 B	328 B	✓
script-HASH.js gzip	397 B	397 B	✓
withRouter-HASH.js gzip	323 B	326 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.59 kB	3.59 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
index.html gzip	523 B	522 B	N/A
link.html gzip	538 B	537 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	520 B	520 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
edge-ssr.js gzip	129 kB	129 kB	N/A
page.js gzip	209 kB	209 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
middleware-b..fest.js gzip	670 B	667 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.3 kB	31.3 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
274-experime...dev.js gzip	322 B	322 B	✓
274.runtime.dev.js gzip	314 B	314 B	✓
app-page-exp...dev.js gzip	376 kB	376 kB	✓
app-page-exp..prod.js gzip	131 kB	131 kB	✓
app-page-tur..prod.js gzip	144 kB	144 kB	✓
app-page-tur..prod.js gzip	140 kB	140 kB	✓
app-page.run...dev.js gzip	364 kB	364 kB	✓
app-page.run..prod.js gzip	127 kB	127 kB	✓
app-route-ex...dev.js gzip	37.6 kB	37.6 kB	✓
app-route-ex..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.4 kB	25.4 kB	✓
app-route.ru...dev.js gzip	39.2 kB	39.2 kB	✓
app-route.ru..prod.js gzip	25.4 kB	25.4 kB	✓
pages-api-tu..prod.js gzip	9.69 kB	9.69 kB	✓
pages-api.ru...dev.js gzip	11.6 kB	11.6 kB	✓
pages-api.ru..prod.js gzip	9.68 kB	9.68 kB	✓
pages-turbo...prod.js gzip	21.9 kB	21.9 kB	✓
pages.runtim...dev.js gzip	27.7 kB	27.7 kB	✓
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	916 kB	916 kB	✓
Overall change	2.48 MB	2.48 MB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js kdy1/alloc-to-owned	Change
0.pack gzip	2.1 MB	2.1 MB	N/A
index.pack gzip	74.6 kB	75.9 kB	⚠️ +1.31 kB
Overall change	74.6 kB	75.9 kB	⚠️ +1.31 kB

Diff details

Diff for main-HASH.js

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Commit: 55ce54c