DLN.
PerformanceBot

Performance Fixer Agent

Identifies and resolves performance issues including N+1 queries, memory bloat, missing indexes, and slow database operations. Measurable improvements with before/after benchmarks.

The Silent Performance Killers

Your app worked fine with 100 users. Now with 10,000, pages take 5+ seconds to load:

  • "It was fast in development" — but production has real data volumes
  • "The database is the bottleneck" — usually it's your queries, not the DB
  • "We need to add caching" — often fixing the query is simpler
  • "Let's just add more servers" — throwing money at fixable code

The result? Angry users, expensive infrastructure bills, and a team that's afraid to touch the slow code because "it might break."

How the Agent Works

1

Performance Profiling

Identifies the actual bottlenecks in your application.

  • → Enables bullet gem to detect N+1 queries
  • → Analyzes query logs for repeated similar queries
  • → Identifies slow endpoints and their database impact
2

N+1 Query Resolution

Adds eager loading to eliminate redundant database calls.

  • → Adds includes, preload, or eager_load as appropriate
  • → Uses joins when WHERE conditions apply to associations
  • → Adds counter caches for frequent count operations
3

Index Optimization

Adds missing indexes and optimizes existing ones.

  • → Identifies columns frequently used in WHERE and ORDER clauses
  • → Creates composite indexes for multi-column queries
  • → Removes unused indexes that slow down writes
4

Memory Optimization

Fixes patterns that load too much data into memory.

  • → Replaces .all.each with find_each for batch processing
  • → Uses select to load only needed columns
  • → Moves heavy operations to background jobs
5

Benchmark Validation

Proves the improvements with measurable results.

  • → Runs before/after benchmarks for each optimization
  • → Documents query count reduction (e.g., "50 queries → 3 queries")
  • → PR includes benchmark results as proof.

Safety Guarantees

Behavior Preservation

Optimizations don't change what the code does, only how fast it does it.

Test Suite Validation

Every change passes your existing test suite before it's submitted.

Safe Migrations

Index additions use CONCURRENTLY to avoid locking tables.

Incremental Changes

Each optimization is a separate commit. Easy to revert if needed.

Proven Patterns

Uses standard Rails optimization patterns. No experimental techniques.

Documented Impact

Every PR shows the performance improvement with numbers, not promises.

What This Is NOT

  • ✗ Not premature optimization. Targets measured bottlenecks, not theoretical problems.
  • ✗ Not "add caching everywhere." Fixes the root cause first. Caching is a last resort.
  • ✗ Not architectural rewrites. Works within your existing patterns. No big-bang changes.
  • ✗ Not guesswork. Every optimization is backed by profiling data and benchmarks.

Typical Results

90%
reduction in database queries
3x
faster page load times
0
N+1 queries in critical paths

Ready to Speed Up Your App?

Start with a $1,500 audit. Get a performance report showing your top bottlenecks and estimated improvements.

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