Chrysopoeia

Extract max value from existing code. Identify gold (high-value, well-designed), lead (resource-heavy, poorly optimized), dross (dead weight). Amplify gold, transmute lead, remove dross.

When Use

• Optimizing working but sluggish codebase for performance
• Refining API surface with accumulated cruft
• Reducing bundle size, memory footprint, startup time
• Prepping code for open-source release (extract valuable core)
• Code works correctly but doesn't shine — needs polish, not rewrite

Inputs

• Required: Codebase or module to optimize (file paths)
• Required: Value metric (performance, API clarity, bundle size, readability)
• Optional: Profiling data or benchmarks showing current performance
• Optional: Budget or target (e.g., "reduce bundle by 40%", "sub-100ms response")
• Optional: Constraints (can't change public API, must maintain backward compat)

Steps

Step 1: Assay — Classify the Material

Classify every element by value contribution.

1. Define value metric from Inputs (performance, clarity, size, etc.)
2. Inventory elements (functions, modules, exports, dependencies)
3. Classify each:

Value Classification:
+--------+---------------------------------------------------------+
| Gold   | High value, well-designed. Amplify and protect.         |
| Silver | Good value, minor imperfections. Polish.                |
| Lead   | Functional but heavy — poor performance, complex API.   |
|        | Transmute into something lighter.                       |
| Dross  | Dead code, unused exports, vestigial features.          |
|        | Remove entirely.                                        |
+--------+---------------------------------------------------------+

4. Performance optimization: profile first.
   • Identify hot paths (where time spent)
   • Identify cold paths (rarely-run code, may be dross)
   • Measure memory allocation patterns
5. Produce Assay Report: element-by-element classification with evidence

Got: Every significant element classified with evidence. Gold elements identified for protection. Lead elements prioritized by impact.

If fail: No profiling tools? Use static analysis — function complexity (cyclomatic), dependency count, code size as proxies. Codebase too large? Focus critical path first.

Step 2: Refine — Amplify the Gold

Protect and enhance highest-value elements.

1. Each Gold element:
   • Ensure comprehensive tests (most valuable assets)
   • Document interface clearly if not already
   • Consider extraction as reusable module
2. Each Silver element:
   • Apply targeted improvements (better naming, clearer types, minor optimizations)
   • Bring test coverage to Gold level
   • Resolve minor code smells without restructuring
3. Do not modify Gold/Silver behavior. Only improve polish and protection.

Got: Gold and Silver elements better tested, documented, protected. No behavioral changes. Quality improvements only.

If fail: "Gold" element reveals hidden problems under closer inspection? Reclassify. Honest about value beats protecting flawed code.

Step 3: Transmute — Convert Lead to Gold

Transform heavy, inefficient elements into optimized equivalents.

1. Prioritize Lead elements by impact (highest resource consumption first)
2. Each Lead element, choose transmutation strategy:
   • Algorithm optimization: Replace O(n^2) with O(n log n). Eliminate redundant computation.
   • Caching/memoization: Store expensive results requested repeatedly
   • Lazy evaluation: Defer computation until results actually needed
   • Batch processing: Combine many small operations into fewer large ones
   • Structural simplification: Reduce cyclomatic complexity, flatten deep nesting
3. Apply strategy. Measure improvement.
   • Before/after benchmarks for performance changes
   • Before/after line counts for complexity changes
   • Before/after dependency counts for coupling changes
4. Verify behavioral equivalence after each transmutation.

Got: Measurable improvement on target value metric. Each transmuted element performs better than Lead predecessor. Identical behavior maintained.

If fail: Lead element resists optimization within current interface? Interface itself may be problem. Transmutation may require changing how element is called, not just implementation.

Step 4: Purge — Remove the Dross

Eliminate dead weight.

1. Each Dross element, verify truly unused:
   • Search all references (grep, IDE find-usages)
   • Check dynamic references (string-based dispatch, reflection)
   • Check external consumers (if library)
2. Remove confirmed dross:
   • Delete dead code, unused exports, vestigial features
   • Remove unused dependencies from package manifests
   • Clean up config for removed features
3. Verify nothing breaks after each removal (run tests)
4. Document what removed and why (commit messages, not code)

Got: Codebase lighter. Bundle size, dependency count, or code volume measurably reduced. All tests pass.

If fail: Removing element breaks something? Wasn't dross. Reclassify. Dynamic references make usage hard to verify? Add temp logging before deletion to confirm no runtime access.

Step 5: Verify — Weigh the Gold

Measure overall improvement.

1. Run same benchmarks/metrics from Step 1
2. Compare before/after on target value metric
3. Document chrysopoeia results:
   • Elements refined (Gold/Silver improvements)
   • Elements transmuted (Lead → Gold, with measurements)
   • Elements purged (Dross removed, with size/count impact)
   • Overall metric improvement (e.g., "47% faster", "32% smaller bundle")

Got: Measurable, documented improvement on target value metric. Codebase demonstrably more valuable.

If fail: Overall improvement marginal? Original code may have been better than assumed. Document learnings — knowing code is near-optimal is itself valuable.

Checks

• Assay report classifies all significant elements with evidence
• Gold elements have comprehensive tests and documentation
• Lead transmutations show measurable before/after improvement
• Dross removal verified with reference checks before deletion
• All tests pass after each stage
• Overall improvement measured and documented
• No behavioral regressions introduced
• Constraints from Inputs satisfied

Pitfalls

• Premature optimization: Optimizing without profiling. Measure first. Optimize hot paths.
• Polishing dross: Effort on code that should be deleted. Classify before refining.
• Breaking Gold: Optimization that degrades best code. Gold should only get better, never worse.
• Unmeasured claims: "Feels faster" is not chrysopoeia. Every improvement quantified.
• Optimizing cold paths: Effort on code that runs once at startup when bottleneck is request loop.

See Also

• athanor — Full four-stage transformation when chrysopoeia reveals code needs restructuring, not just optimization
• transmute — Targeted conversion when Lead element needs paradigm shift
• review-software-architecture — Architecture-level evaluation complementing code-level chrysopoeia
• review-data-analysis — Data pipeline optimization parallels code optimization