Performance Test Results

Project Information

plain-nuxt: ./test/fixtures/plain-nuxt
i18n-micro: ./test/fixtures/i18n-micro
i18n: ./test/fixtures/i18n
CLI: pnpm -C scripts cli performance / pnpm test:performance

Description

Compares plain Nuxt (baseline without an i18n module), i18n-micro, and @nuxtjs/i18n v10.6 under one shared dictionary profile.

Focus: build time, peak RSS, deployable code vs translations vs total, and server behaviour under Artillery + Autocannon.

Methodology notes

Metrics are means of 3 consecutive runs per fixture (fixture A ×3, then B ×3, then C ×3 — not interleaved).
Translations include locale JSON under locales/ / _locales/ / translations/, everything under chunks/raw/, and matching locale chunks. Older reports that showed @nuxtjs/i18n “translations: 0 B” and a huge “code” column were counting message chunks as app code.
plain-nuxt serves the same leaf volume as static public/translations JSON (not static JS imports). Under Artillery that baseline is I/O-heavy; it is not “i18n overhead”, it is the cost of fetching large JSON per request.

Runs

All metrics below are means across 3 runs.

Fixture profile

Knob	Value
Locales	4 (`en`, `de`, `ru`, `fr`)
Pages	2 (`index`, `page`)
Index tree	depth 5, branch 7 → 16,807 leaf keys / locale
Secondary pages	depth 5, branch 6 → 7,776 leaf keys / page / locale
Goal	Default CLI profile (`--locales 4 --keys 10000`); raise knobs for regression-radar loads

Dictionaries come from test/fixtures/perf-shared/runtime.json (written by the CLI) so all three fixtures stay aligned.

Dependency Versions

Dependency	Version
node	v22.22.1
nuxt	4.5.1
nuxt-i18n-micro	3.25.0
@nuxtjs/i18n	10.6.0

Source dictionaries (pre-build)

Fixture	On-disk locale data
plain-nuxt	98.42 MB
i18n-v10	6.8 MB
i18n-micro	6.8 MB

From runtime.json (4 locales, 16,807 index leaf keys).

Build Performance for test/fixtures/plain-nuxt

Build Time: 5.32 seconds
Bundle Size: 8.33 MB (code: 1.53 MB, translations: 6.8 MB)
Code Bundle: client: 201.88 KB, server: 1.33 MB
Max / Avg CPU: 207.10% / 166.29%
Max / Avg Memory: 810.26 MB / 585.14 MB

Build Performance for test/fixtures/i18n

Build Time: 8.34 seconds
Bundle Size: 9.37 MB (code: 2.16 MB, translations: 7.21 MB)
Code Bundle: client: 315.17 KB, server: 1.86 MB
Max / Avg CPU: 203.97% / 164.39%
Max / Avg Memory: 1820.57 MB / 1177.11 MB

Build Performance for test/fixtures/i18n-micro

Build Time: 5.34 seconds
Bundle Size: 8.54 MB (code: 1.74 MB, translations: 6.8 MB)
Code Bundle: client: 272.93 KB, server: 1.48 MB
Max / Avg CPU: 203.60% / 177.27%
Max / Avg Memory: 1065.16 MB / 667.77 MB

Build Performance Summary (mean of 3 runs)

Project	Build Time	Code Bundle	Translations	Total
plain-nuxt (baseline)	5.32s	1.53 MB	6.8 MB	8.33 MB
i18n-v10	8.34s	2.16 MB	7.21 MB	9.37 MB
i18n-micro	5.34s	1.74 MB	6.8 MB	8.54 MB

“Total” = what gets deployed (code + translations). Micro keeps translations as lazy JSON; @nuxtjs/i18n still ships a larger code graph even after message chunks are classified correctly.

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Stress Test Results for plain-nuxt

Resource Usage

Max / Avg CPU: 132.80% / 86.34%
Max / Avg Memory: 506.66 MB / 332.97 MB

Artillery

Duration: 79.64s · RPS: 109.00 · Error rate: 0.00%
Latency avg / p50 / p95 / p99: 1193.80 / 604.00 / 6440.57 / 7658.90 ms

Autocannon (10c / 10s)

RPS: 65.30 · Latency avg / p50 / p95 / p99: 151.64 / 150.00 / 178.67 / 191.33 ms · Errors: 0

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Stress Test Results for i18n-v10

Resource Usage

Max / Avg CPU: 128.90% / 81.95%
Max / Avg Memory: 462.53 MB / 335.30 MB

Artillery

Duration: 79.28s · RPS: 142.67 · Error rate: 0.00%
Latency avg / p50 / p95 / p99: 955.83 / 125.20 / 7709.80 / 7865.60 ms

Autocannon (10c / 10s)

RPS: 71.60 · Latency avg / p50 / p95 / p99: 138.80 / 117.33 / 291.67 / 332.33 ms · Errors: 0

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Stress Test Results for i18n-micro

Resource Usage

Max / Avg CPU: 126.17% / 78.28%
Max / Avg Memory: 302.30 MB / 229.25 MB

Artillery

Duration: 73.10s · RPS: 275.33 · Error rate: 0.00%
Latency avg / p50 / p95 / p99: 483.43 / 53.37 / 3777.97 / 4203.20 ms

Autocannon (10c / 10s)

RPS: 161.67 · Latency avg / p50 / p95 / p99: 62.04 / 49.67 / 131.00 / 217.67 ms · Errors: 0

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Stress Test Summary (mean of 3 runs)

Artillery

Project	Avg Response	P95	P99	RPS	Error Rate
plain-nuxt	1193.80 ms	6440.57 ms	7658.90 ms	109.00	0.00%
i18n-v10	955.83 ms	7709.80 ms	7865.60 ms	142.67	0.00%
i18n-micro	483.43 ms	3777.97 ms	4203.20 ms	275.33	0.00%

Autocannon

Project	Avg Latency	P50	P95	P99	RPS
plain-nuxt	151.64 ms	150.00 ms	178.67 ms	191.33 ms	65.30
i18n-v10	138.80 ms	117.33 ms	291.67 ms	332.33 ms	71.60
i18n-micro	62.04 ms	49.67 ms	131.00 ms	217.67 ms	161.67

Performance Comparison

Throughput (Requests per Second)

Winner: i18n-micro with 162 RPS

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Latency Distribution

Winner: i18n-micro with 62.04 ms avg latency

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Quick Comparison

Metric	plain-nuxt	i18n-v10	i18n-micro	Best
RPS (Autocannon)	65	72	162	i18n-micro
Avg Latency	151.64 ms	138.80 ms	62.04 ms	i18n-micro
P99 Latency	191.33 ms	332.33 ms	217.67 ms	plain-nuxt
Errors	0	0	0	-

Comparison: plain-nuxt (baseline) vs i18n v10

Metric	plain-nuxt (baseline)	i18n v10	Difference
Max Memory	506.66 MB	462.53 MB	-44.13 MB
Avg Memory	332.97 MB	335.30 MB	+2.33 MB
Response Avg	1193.80 ms	955.83 ms	-237.97 ms
Response P95	6440.57 ms	7709.80 ms	+1269.23 ms
RPS (Artillery)	109.00	142.67	+33.67
RPS (Autocannon)	65.30	71.60	+6.30
Latency avg (AC)	151.64 ms	138.80 ms	-12.84 ms

Comparison: plain-nuxt (baseline) vs i18n-micro

Metric	plain-nuxt (baseline)	i18n-micro	Difference
Max Memory	506.66 MB	302.30 MB	-204.36 MB
Avg Memory	332.97 MB	229.25 MB	-103.72 MB
Response Avg	1193.80 ms	483.43 ms	-710.37 ms
Response P95	6440.57 ms	3777.97 ms	-2662.60 ms
RPS (Artillery)	109.00	275.33	+166.33
RPS (Autocannon)	65.30	161.67	+96.37
Latency avg (AC)	151.64 ms	62.04 ms	-89.60 ms

Comparison: i18n v10 vs i18n-micro

Metric	i18n v10	i18n-micro	Difference
Max Memory	462.53 MB	302.30 MB	-160.23 MB
Avg Memory	335.30 MB	229.25 MB	-106.05 MB
Response Avg	955.83 ms	483.43 ms	-472.40 ms
Response P95	7709.80 ms	3777.97 ms	-3931.83 ms
RPS (Artillery)	142.67	275.33	+132.67
RPS (Autocannon)	71.60	161.67	+90.07
Latency avg (AC)	138.80 ms	62.04 ms	-76.76 ms

Notes

Shared profile: 4 locales × 2 pages × ~16.8k index leaves.
Artillery: 6s warm-up @6 VU/s + 60s main @60 VU/s. Autocannon: 10 connections × 10s.
Re-run: pnpm test:performance or pnpm -C scripts cli performance --locales N --keys K --only all|micro|i18n|plain --runs N.

Performance Test Results ​

Project Information ​

Description ​

Methodology notes ​

Runs ​

Fixture profile ​

Dependency Versions ​

Source dictionaries (pre-build) ​

Build Performance for test/fixtures/plain-nuxt ​

Build Performance for test/fixtures/i18n ​

Build Performance for test/fixtures/i18n-micro ​

Build Performance Summary (mean of 3 runs) ​

Stress Test Results for plain-nuxt ​

Resource Usage ​

Artillery ​

Autocannon (10c / 10s) ​

Stress Test Results for i18n-v10 ​

Resource Usage ​

Artillery ​

Autocannon (10c / 10s) ​

Stress Test Results for i18n-micro ​

Resource Usage ​

Artillery ​

Autocannon (10c / 10s) ​

Stress Test Summary (mean of 3 runs) ​

Artillery ​

Autocannon ​

Performance Comparison ​

Throughput (Requests per Second) ​

Latency Distribution ​

Quick Comparison ​

Comparison: plain-nuxt (baseline) vs i18n v10 ​

Comparison: plain-nuxt (baseline) vs i18n-micro ​

Comparison: i18n v10 vs i18n-micro ​

Notes ​

Performance Test Results

Project Information

Description

Methodology notes

Runs

Fixture profile

Dependency Versions

Source dictionaries (pre-build)

Build Performance for test/fixtures/plain-nuxt

Build Performance for test/fixtures/i18n

Build Performance for test/fixtures/i18n-micro

Build Performance Summary (mean of 3 runs)

Stress Test Results for plain-nuxt

Resource Usage

Artillery

Autocannon (10c / 10s)

Stress Test Results for i18n-v10

Resource Usage

Artillery

Autocannon (10c / 10s)

Stress Test Results for i18n-micro

Resource Usage

Artillery

Autocannon (10c / 10s)

Stress Test Summary (mean of 3 runs)

Artillery

Autocannon

Performance Comparison

Throughput (Requests per Second)

Latency Distribution

Quick Comparison

Comparison: plain-nuxt (baseline) vs i18n v10

Comparison: plain-nuxt (baseline) vs i18n-micro

Comparison: i18n v10 vs i18n-micro

Notes