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Table of Contents
2. Profile Database Queries
Check for N 1 Problems
Use Query Logging
Optimize with Indexes
3. Use Laravel's Built-in Profiling Tools
4. Analyze Application Bootstrapping and Service Providers
5. Cache Aggressively
6. Profile in Production (Safely)
7. Check External Services and Filesystem
Summary: Step-by-step Profiling Plan
Home PHP Framework Laravel How to profile a slow Laravel application?

How to profile a slow Laravel application?

Jul 29, 2025 am 01:21 AM
laravel Performance analysis

Enable Debugbar or Telescope in local env to get real-time insights into queries, rendering, and memory usage; 2. Check for N 1 queries using eager loading and optimize slow queries by adding indexes on frequently queried columns; 3. Benchmark slow code blocks using Log::debug() or Laravel’s benchmark helper to isolate performance issues; 4. Cache routes, config, views, and expensive data using Redis or Memcached to reduce redundant processing; 5. Use Blackfire or Tideways for deep PHP profiling in production to identify bottlenecks in functions and third-party packages; 6. Offload slow operations like API calls, mail, or SMS to queues to prevent blocking requests; systematically start from the request and move inward—frontend → Laravel → queries → external calls—with caching and query optimization typically delivering the most significant performance gains.

How to profile a slow Laravel application?

A slow Laravel application can be frustrating, but profiling it systematically helps pinpoint the root cause. Here’s how to identify and fix performance bottlenecks in Laravel.

How to profile a slow Laravel application?

1. Enable Laravel Telescope or Debugbar for Quick Insights

Start with tools that give you real-time visibility into what’s happening on each request.

  • Laravel Debugbar adds a toolbar to your browser showing:
    • Query count and execution time
    • View rendering time
    • Memory usage
    • Route and middleware info

Install it via Composer:

How to profile a slow Laravel application?
composer require barryvdh/laravel-debugbar --dev
  • Laravel Telescope (more advanced) logs requests, queries, exceptions, cache, and more.
composer require laravel/telescope
php artisan telescope:install
php artisan migrate

Use these during development only — they add overhead and shouldn’t run in production.


2. Profile Database Queries

Slow queries are a common culprit.

How to profile a slow Laravel application?

Check for N 1 Problems

Use Debugbar or Telescope to spot repeated queries. For example:

$users = User::all();
foreach ($users as $user) {
    echo $user->profile->email; // Triggers a query each time!
}

Fix it with eager loading:

$users = User::with('profile')->get();

Use Query Logging

In a controller or route for testing:

DB::enableQueryLog();
// run some code
dd(DB::getQueryLog());

Look for:

  • Long-running queries
  • Missing indexes
  • Full table scans

Optimize with Indexes

Add database indexes on frequently queried columns:

// In a migration
$table->index('user_id');
$table->index('created_at');

3. Use Laravel's Built-in Profiling Tools

Laravel provides Log::debug() and the benchmark helper to time specific code blocks.

$start = microtime(true);

// Your slow code here
$expensiveData = SomeService::process();

Log::debug('Processing took: ' . (microtime(true) - $start) . ' seconds');

Or use the benchmark helper (Laravel 9 ):

benchmark('expensive-operation', function () {
    return SomeService::process();
});

Wrap suspected slow sections (e.g., API calls, complex calculations) to isolate delays.


4. Analyze Application Bootstrapping and Service Providers

Too many service providers or heavy boot logic can slow down every request.

  • Run php artisan down and test a minimal route:

    Route::get('/ping', function () {
        return 'OK';
    });

    If this is fast, the issue is likely in middleware, service providers, or your app logic.

  • Use Clockwork (adds Chrome DevTools panel):

    composer require itsgoingd/clockwork --dev

    It shows timing for:

    • Laravel lifecycle phases
    • Events fired
    • Cache hits/misses

5. Cache Aggressively

Poor caching multiplies work unnecessarily.

  • Route Caching (if using closures, skip this):

    php artisan route:cache
  • Config Caching:

    php artisan config:cache
  • View Caching:

    php artisan view:cache
  • Data Caching: Use Redis or Memcached for expensive queries:

    $data = Cache::remember('expensive-data', 3600, function () {
        return DB::table('...')->get();
    });

6. Profile in Production (Safely)

Use tools that don’t impact performance much:

  • Sentry or Laravel Flare for exception and performance tracking.
  • Blackfire.io or Tideways for deep PHP profiling:
    • Shows CPU and memory usage per function
    • Reveals bottlenecks in third-party packages

Example with Blackfire:

blackfire run php artisan route:list

These tools help profile real traffic without enabling debug tools site-wide.


7. Check External Services and Filesystem

Slowdowns often come from outside Laravel:

  • API calls (e.g., payment gateways, geocoding) — mock them during profiling.
  • Filesystem — avoid local disk for large reads/writes; use s3 or cache results.
  • Mail/SMS jobs — dispatch them asynchronously.

Use queues for slow operations:

SendNotification::dispatch($user)->onQueue('default');

Summary: Step-by-step Profiling Plan

  • [ ] Enable Debugbar or Telescope in local env
  • [ ] Check for N 1 queries and add indexes
  • [ ] Benchmark slow methods
  • [ ] Cache routes, config, views, and data
  • [ ] Use Blackfire/Tideways for deep PHP profiling
  • [ ] Offload slow tasks to queues

Basically, start from the request and move inward: frontend → Laravel → queries → external calls. Most slowdowns come from database or external services — not PHP itself.

Fix the big wins first: caching and query optimization usually give 10x improvements.

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