JavaScript Silent Performance Drift Simulator & Budget Studio

Interaction to Next Paint (INP)

45ms Good

Threshold: <200ms

Total Blocking Time (TBT)

45ms Good

Threshold: <200ms

Largest Contentful Paint (LCP)

1.10s Good

Threshold: <2.5s

Bundle Transfer Size

142 KB Healthy

Budget: 250 KB uncompressed

Unmemoized Re-renders

2 Optimal

Cascade per filter click

Engineering Roadmap (12 Sprints)

4 of 12 applied

Click individual commits to toggle them into the build, or scrub the timeline to simulate progressive creeping rot:

Main Thread Execution Trace & 16.6ms Frame Budget

60 FPS Target (16.6ms/frame)

Task: Synthetic Filter Click Event

Duration: 42ms | Execution category: Scripting

Within 50ms LongTask Budget

Script Evaluation

Component Rendering

Recalculate Style & Layout

Long Task Violation (>50ms)

Microtask Queue

Simulated Virtual Component Re-render Cascade

Active Architecture Remediations

0ms saved

Toggle architectural fixes to prevent or reverse silent performance rot without reverting product features:

Barrel Tree-Shaking

Direct sub-path utility imports; strips unused library weight (-65 KB, -50ms)

State Colocation & Context Split

Move filter state down to local subtree; cuts provider re-renders (-12 re-renders)

Code-Splitting & Lazy Widgets

React.lazy on dashboard chart widgets; recovers initial load (-160 KB, -100ms)

Worker Offloading & Debounce

Move data transforms off main thread; reduces long task spikes (-80ms TBT)