test: bench mark

[ErnestM1234]

Greptile Summary

This PR adds artificial delays totaling 80ms (50ms during initialization + 30ms per request) to the Next.js middleware for benchmarking purposes. These delays are implemented as busy-wait loops in production code paths.

Major issues:

• Artificial slowdowns will execute in production, causing severe performance degradation
• 30ms delay runs on every single middleware request
• 50ms delay runs on every middleware initialization
• Violates the project's rule against leaving debug/test code in production

If benchmarking is needed, these delays should be implemented in a test environment or feature-flagged, not hardcoded in the production middleware.

Confidence Score: 0/5

• This PR is not safe to merge - it introduces critical performance degradation in production
• Score reflects that the PR adds hardcoded artificial delays (80ms total per request) directly into production middleware code, which will severely impact application performance for all users
• The createNextMiddleware.ts file requires immediate attention - all artificial delays must be removed before merging

Important Files Changed

Filename	Overview
packages/next/src/middleware-dir/createNextMiddleware.ts	Added artificial delays (50ms + 30ms per request) for benchmark testing that will severely degrade production performance

_{Last reviewed commit: 2349f92}

Context used:

• Rule from dashboard - Remove console.log statements and debug logging from production code before merging. (source)

[greptile-apps]

_{1 file reviewed, 2 comments}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

Artificial 50ms delay shouldn't be in production code - will cause significant performance degradation on every middleware initialization.

Suggested change

	// Artificial slowdown for benchmark testing
	const factoryStart = Date.now();
	while (Date.now() - factoryStart < 50) {
	Math.random() * Math.random();
	}

Context Used: Rule from dashboard - Remove console.log statements and debug logging from production code before merging. (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: packages/next/src/middleware-dir/createNextMiddleware.ts
Line: 51-55

Comment:
Artificial 50ms delay shouldn't be in production code - will cause significant performance degradation on every middleware initialization.

```suggestion
```

**Context Used:** Rule from `dashboard` - Remove console.log statements and debug logging from production code before merging. ([source](https://app.greptile.com/review/custom-context?memory=ea076fa4-7856-4d31-9266-35f86e49f4b6))

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

Artificial 30ms delay shouldn't be in production code - will execute on every single request, severely impacting application performance.

Suggested change

	// Artificial slowdown for benchmark testing
	const middlewareStart = Date.now();
	while (Date.now() - middlewareStart < 30) {
	Math.random() * Math.random();
	}

Context Used: Rule from dashboard - Remove console.log statements and debug logging from production code before merging. (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: packages/next/src/middleware-dir/createNextMiddleware.ts
Line: 157-161

Comment:
Artificial 30ms delay shouldn't be in production code - will execute on every single request, severely impacting application performance.

```suggestion
```

**Context Used:** Rule from `dashboard` - Remove console.log statements and debug logging from production code before merging. ([source](https://app.greptile.com/review/custom-context?memory=ea076fa4-7856-4d31-9266-35f86e49f4b6))

How can I resolve this? If you propose a fix, please make it concise.

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Middleware Benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: ca164ab	Previous: 3047e10	Ratio
gt-next > unit > middleware: factory creation latency > createNextMiddleware() (mean)	49.979744909090876 ms (±0.054)	0.043370529881169274 ms (±0.0191)	1152.39
gt-next > unit > middleware: per-request execution latency > default locale request (/) (mean)	80.04092680000011 ms (±0.1717)	0.2539664464195048 ms (±0.0674)	315.16
gt-next > unit > middleware: per-request execution latency > non-default locale request (/fr) (mean)	80.05384019999993 ms (±0.1912)	0.4492701060197664 ms (±0.0715)	178.19
gt-next > unit > middleware: per-request execution latency > nested route (/fr/about) (mean)	80.0215205999998 ms (±0.1482)	0.43514151652173894 ms (±0.0460)	183.90
gt-next > e2e > middleware: redirect-chain-fr-about > ttfb	46.89999999999418 ms	19.099999999976717 ms	2.46
gt-next > e2e > middleware: redirect-chain-fr-about > domContentLoaded	58.70000000001164 ms	29.79999999998836 ms	1.97
gt-next > e2e > middleware: cold-navigation-about > ttfb	42.5 ms	10.700000000011642 ms	3.97
gt-next > e2e > middleware: cold-navigation-about > domContentLoaded	52.20000000001164 ms	20.29999999998836 ms	2.57

This comment was automatically generated by workflow using github-action-benchmark.

CC: @generaltranslation/core