Performance terms
Every millisecond matters — here is how to win them back
Slow software costs money, loses users, and erodes trust. Performance engineering covers profiling, caching strategies, database query optimisation, network latency, memory management, and the architectural patterns that keep systems fast under real-world load. Most performance problems are invisible until they are not — these terms help you find and fix them before your users do.
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Most referenced — Performance
Cache Stampede / Thundering Herd 2PHP Session Performance & Locking 2N+1 Problem in Doctrine & Eloquent 2Eager Loading 2HTTP/2 & HTTP/3 2Brotli vs gzip Compression 2Excessive File I/O 2Read Replicas & Database Scaling 2
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Terms pinged66 / 66
Distinct agents11
Index Selectivity & Cardinality PHP 5.0+
High-cardinality columns (user IDs, emails) make effective indexes; low-cardinality columns (boolean, status with 3 values) rarely benefit from single-column indexes.
2mo ago
performance intermediate
Materialized Views PHP 5.0+
Pre-computed query results stored as a real table — dramatically faster reads for expensive aggregations at the cost of periodic refresh overhead.
2mo ago
performance advanced
Memoization
Caching the result of a pure function call keyed by its arguments so repeated calls with the same inputs return immediately.
2mo ago
performance intermediate
Memory Leak PHP 5.0+
Memory allocated during execution that is never released, causing PHP processes to grow until they exhaust available memory or are restarted.
2mo ago
performance intermediate
N+1 Problem in Doctrine & Eloquent PHP 7.0+
Accidentally issuing one query per related entity instead of one JOIN — the most common ORM performance pitfall, solved by eager loading.
2mo ago
performance intermediate
Object Pooling PHP 7.0+
Reusing a fixed set of pre-initialised expensive objects rather than creating and destroying them on every request — reducing allocation overhead.
2mo ago
performance advanced
Opcode Caching PHP 5.5+
Storing precompiled PHP bytecode in memory to skip the parse-and-compile phase on subsequent requests.
2mo ago
performance intermediate
Pagination Strategies PHP 5.0+
Techniques for splitting large result sets across pages to avoid loading unbounded data in a single query.
2mo ago
performance beginner
PHP JIT — When It Helps (and When It Doesn't) PHP 8.0+
PHP 8.0's JIT compiler converts hot bytecode to native machine code — significant for CPU-bound code, but minimal for typical I/O-bound web requests.
2mo ago
performance advanced
PHP Preloading — Performance Impact PHP 7.4+
Quantifying preloading gains: most benefit on large frameworks (5–15%), negligible on tiny apps — how to measure and tune opcache.preload.
2mo ago
performance advanced
PHP Session Performance & Locking PHP 5.0+
PHP's file-based sessions acquire an exclusive lock per request — blocking concurrent requests from the same user until the lock is released.
2mo ago
performance intermediate
Profiling & Benchmarking PHP 5.0+
Measuring where a PHP application spends its time and memory to identify the highest-impact optimisation targets.
2mo ago
performance intermediate
Query Optimisation PHP 5.0+ Analysing and rewriting database queries to reduce execution time, I/O, and resource usage.
2mo ago
performance intermediate
Query Plan & EXPLAIN Analysis
The execution strategy the database engine chooses for a query — analysed with EXPLAIN to identify full scans, missing indexes, and bottlenecks.
2mo ago
performance intermediate
Queue Worker Tuning PHP 7.0+
Configuring PHP queue workers (Laravel Horizon, Supervisor) for throughput, memory limits, graceful restarts, and concurrency — preventing job failures and memory leaks.
2mo ago
performance intermediate
Read Replicas & Database Scaling PHP 5.0+
Directing read queries to replica servers while writes go to the primary — a simple way to scale read throughput horizontally without sharding.
2mo ago
performance 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.
2mo ago
performance intermediate
Regex in Loop PHP 5.0+
Compiling and executing the same regular expression on every iteration of a loop — hoist the pattern outside.
2mo ago
performance 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.
2mo ago
performance beginner
Space Complexity
A measure of how much memory an algorithm uses relative to its input size, expressed in Big O notation.
2mo ago
performance intermediate