Tag: performance
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Amazonbot 39Perplexity 16ChatGPT 11Scrapy 6Google 4Ahrefs 3SEMrush 2
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Most referenced — #performance
PHP Execution Model — Shared-Nothing Architecture 6Big-O Notation 6Generators & yield 6Memory Leak 5RoadRunner — Persistent PHP Worker 5Async Processing / Job Queues 4PHP Async Frameworks 4PHP-FPM 4
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Tag total7.4k pings
Terms pinged222 / 222
Distinct agents14
Real User Monitoring (RUM)
ES2015
Collecting performance and error data from actual user browsers in production — capturing real-world conditions that synthetic lab testing cannot reproduce.
3mo ago
observability intermediate
Redis Patterns (Pub/Sub, Sorted Sets, Lua)
PHP 5.0+
Beyond key-value caching, Redis enables queues, leaderboards, rate limiting, pub/sub messaging, and distributed locks via its rich data structures.
3mo ago
performance intermediate
ReDoS (Regex Denial of Service)
A crafted input causes a regex with catastrophic backtracking to consume excessive CPU, making the application unresponsive.
CWE-1333 OWASP A5:2021
3mo ago
security intermediate
7.5
Regex in Loop
PHP 5.0+
Compiling and executing the same regular expression on every iteration of a loop — hoist the pattern outside.
3mo ago
performance intermediate
Regex Performance
Regex performance pitfalls — catastrophic backtracking (ReDoS), unnecessary captures, and poorly anchored patterns that scan more input than needed.
3mo ago
regex advanced
Render-Blocking Resources
CSS and synchronous JavaScript in <head> that prevent the browser from rendering any content until they are downloaded and parsed — the primary cause of slow First Contentful Paint.
3mo ago
frontend intermediate
Searching Algorithms
PHP 5.0+
1
Linear search is O(n) and works on any array. Binary search is O(log n) but requires a sorted array. Hash lookup is O(1) and the right choice for most in-memory searches.
3mo ago
algorithms intermediate
Slow Query Log
PHP 5.0+
A database log of queries exceeding a time threshold — the first place to look when diagnosing PHP application performance problems.
3mo ago
performance beginner
Space Complexity
A measure of how much memory an algorithm uses relative to its input size, expressed in Big O notation.
3mo ago
performance intermediate
SPL Data Structures
PHP 5.3+
PHP's Standard PHP Library provides efficient built-in data structures: SplStack, SplQueue, SplHeap, SplMinHeap, SplDoublyLinkedList, and more.
3mo ago
php advanced
SQL Window Functions
PHP 5.0+
SQL functions that perform calculations across a set of rows related to the current row without collapsing them into a single output row.
3mo ago
database advanced
Tail Latency (p95, p99)
The latency experienced by the slowest requests — p99 is the response time below which 99% of requests fall, the most user-visible metric.
3mo ago
performance advanced
Time Complexity (Big O)
A notation describing how an algorithm's execution time grows relative to input size — O(1), O(n), O(n log n), O(n²)…
3mo ago
performance intermediate
UUID vs ULID vs Auto-Increment
PHP 7.0+
Primary key strategies: auto-increment is simple and fast, UUID v4 is globally unique but random (poor index performance), UUID v7 and ULID are sortable globally unique IDs.
3mo ago
database intermediate
Weak References (WeakReference, WeakMap)
PHP 7.4+
References to objects that don't prevent garbage collection — useful for caches and observer registries that shouldn't extend object lifetimes.
3mo ago
php advanced
Web Workers
ES2015
Background threads in the browser that run JavaScript without blocking the main thread — essential for CPU-intensive tasks that would otherwise freeze the UI.
3mo ago
javascript advanced
Batch Processing
PHP 5.5+
1
Processing records in grouped chunks rather than one at a time, reducing per-record overhead and enabling efficient bulk database operations.
3mo ago
performance intermediate
Lazy Loading
HTML5
Defer loading or initialising a resource until it is actually needed, reducing startup cost and memory usage.
3mo ago
performance beginner
N+1 Query Problem
PHP 5.0+ Executing one query to get N records, then N more queries to fetch related data — one per record.
3mo ago
performance intermediate
OPcache
PHP 5.5+
6
A PHP extension that caches precompiled bytecode in shared memory, eliminating repeated parsing and compilation overhead.
3mo ago
php intermediate