---
id: kb-2026-00104
title: Performance API
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: human_only
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: af-performance-api-1
    statement: The Performance API exposes web performance measurement interfaces.
    source_title: Performance API
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/Performance_API
    confidence: medium
  - id: af-performance-api-2
    statement: High Resolution Time defines precise time measurement for web performance APIs.
    source_title: High Resolution Time
    source_url: https://www.w3.org/TR/hr-time-3/
    confidence: medium
  - id: af-performance-api-3
    statement: The User Timing API lets developers create application-specific performance marks and measures.
    source_title: User Timing API
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API
    confidence: medium
completeness: 0.88
known_gaps:
  - Privacy constraints and timer precision changes across browsers
  - Interpreting measurements under network and device variability
disputed_statements: []
primary_sources:
  - id: ps-performance-api-1
    title: Performance API
    type: technical_documentation
    year: 2024
    institution: MDN Web Docs
    url: https://developer.mozilla.org/en-US/docs/Web/API/Performance_API
  - id: ps-performance-api-2
    title: High Resolution Time
    type: standard
    year: 2024
    institution: W3C
    url: https://www.w3.org/TR/hr-time-3/
  - id: ps-performance-api-3
    title: User Timing API
    type: technical_documentation
    year: 2024
    institution: MDN Web Docs
    url: https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API
secondary_sources: []
updated: '2026-05-28'
---
## TL;DR
The Performance API provides browser interfaces for measuring page and application timing. It is a measurement layer, not an optimization by itself.

## Core Explanation
Developers can use high-resolution time, performance entries, marks, and measures to understand real runtime behavior in the browser.

## Detailed Analysis
The repaired article uses MDN and W3C sources for Performance API, High Resolution Time, and User Timing.

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