Have Codex build a drop-in renderer to fix perf

A Three.js family Halloween project had load and frame-spike issues; Codex built a new renderer as a drop-in.

In short

What it does: A Three.js family Halloween project had load and frame-spike issues; Codex built a new renderer as a drop-in.

Agent: Codex · Category: Coding

Steps in brief:

  1. Design the new renderer yourself.
  2. Ask Codex to build it as a drop-in replacement for the existing one.
  3. Let it work while you do something else.

Who made it: Simon (X post, 23 Sep 2026) · source

Last updated · based on 336 use cases on agentsetups, each credited to its author.

by Simon23 Sep 2026

Prompt for your agent

Goal: Fix load times and frame spikes in a three.js project by replacing the renderer.
Setup: agents used in source: Codex; tools/MCPs stated: three.js.
Steps:
1. Design the new renderer yourself.
2. Ask Codex to build it as a drop-in replacement for the existing one.
3. Let it work while you do something else.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Based on: Simon — https://x.com/iced_coffee_dev/status/2102880675645071652

Steps are from the source. Includes a “Based on” credit line.

I tried this

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Agents, models and tools only what the source states

Agents
Codex
Tools
  • three.js

Sources & credit