← Lab

LAB / 05 · Concept

FOUC Simulator

See how content flicker contaminates perception, behavior and experiment validity.

Read the field note

ConceptStatus: ConceptID: LAB—05

Product previewFOUC Simulator
Sequence showing original content flickering into an experiment variant
05 / EXPERIMENTS

01 / Context

The problem

When a visitor sees the control before the variant appears, exposure is no longer clean. The simulator concept makes that invisible validity problem tangible.

02 / Capabilities

Capabilities

  1. 01

    Compare clean and flickering variant delivery.

  2. 02

    Adjust the delay before the treatment appears.

  3. 03

    Connect visible flicker to measurement and behavior risks.

Technologies

  • A/B testing
  • Performance
  • Behavioral UX
Read the field note ↗

03 / System

Privacy & architecture

An interactive concept derived from the research and implementation notes in the accompanying article.

04 / Honest notes

Known limits

  • This is currently an explanatory concept, not a production diagnostic.
  • Actual flicker must be measured on the target site and network conditions.