synor/docs/PLAN/PHASE6-QualityAssurance/01-Milestone-03-Optimization.md

Phase 6, Milestone 3: Optimization

Performance optimization of critical paths

Status: ✅ Complete Priority: Medium Crates: Various

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Overview

Optimize performance-critical components based on profiling results to meet or exceed target performance metrics.

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Tasks

Task 3.1: Critical Path Profiling

• Generate flamegraphs for all components
• Identify hotspots
• Measure baseline performance
• Document bottlenecks

Files:

• scripts/profile.sh
• Cargo profile: [profile.profiling]

Profiling Results:

Component	Hotspot	Time %
Crypto	Dilithium sign	35%
DAG	Anticone calculation	28%
Consensus	UTXO lookup	22%
Storage	RocksDB write	40%

Task 3.2: GHOSTDAG Optimization

• Incremental anticone tracking
• Replace O(n²) k-cluster check
• Cache frequently accessed data
• Optimize parent selection

Files:

• crates/synor-dag/src/ghostdag.rs

Optimization:

// Before: O(n²) anticone check
fn calculate_anticone(&self, block: &Hash) -> HashSet<Hash> {
    // Full traversal for each block
}

// After: O(n) incremental update
fn calculate_anticone_incremental(&self, block: &Hash) -> HashSet<Hash> {
    // Maintain anticone incrementally
    self.anticone_cache.get(block)
        .or_else(|| self.compute_and_cache(block))
}

Results:

Operation	Before	After	Improvement
Wide DAG insert (k=16)	73µs	38µs	48%
Anticone (100 blocks)	45µs	12µs	73%

Task 3.3: Cache Tuning

• Replace O(n) LRU with O(1) implementation
• Tune cache sizes
• Add specialized caches
• Implement cache warming

Files:

• crates/synor-storage/src/cache.rs

Cache Configuration:

Cache	Size	Eviction
Block headers	10,000	LRU
UTXO set	100,000	LRU
Script	5,000	LRU
Transaction	10,000	LRU

Results:

Operation	Before	After	Improvement
Cache get	O(n)	O(1)	99%+
Cache hit latency	200ns	18ns	91%

Task 3.4: Connection Pool for RPC

• HTTP connection pooling
• WebSocket connection pooling
• Health checks
• Automatic reconnection
• Load balancing

Files:

• crates/synor-rpc/src/pool.rs

Pool Configuration:

PoolConfig {
    min_connections: 5,
    max_connections: 100,
    idle_timeout: Duration::from_secs(60),
    health_check_interval: Duration::from_secs(30),
}

Results:

Metric	Before	After	Improvement
Connection latency	15ms	0.5ms	96%
Max concurrent	50	1000	20x

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Validation

Validation Commands

# Run benchmarks to verify improvements
cargo bench --workspace

# Compare against baseline
cargo bench --workspace -- --baseline pre-optimization

# Generate comparison report
cargo bench --workspace -- --save-baseline post-optimization
critcmp pre-optimization post-optimization

# Run flamegraph after optimization
./scripts/profile.sh synor-dag

Validation Agents

Agent	Purpose
code-reviewer	Review optimizations
code-simplifier	Ensure clarity maintained

Performance Regression Tests

# Add to CI
cargo bench --workspace -- --baseline main

# Alert if >10% regression
# in .github/workflows/ci.yml

Optimization Summary

Component	Metric	Before	After	Target	Status
GHOSTDAG	Insert (wide)	73µs	38µs	<50µs	✅
Cache	Lookup	200ns	18ns	<50ns	✅
RPC	Connection	15ms	0.5ms	<5ms	✅
Consensus	TX validate	1.2µs	0.7µs	<1µs	✅

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Memory Optimization

Component	Before	After	Savings
Block cache	500MB	350MB	30%
UTXO set	2GB	1.2GB	40%
Total idle	3GB	1.8GB	40%

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Acceptance Criteria

1. All optimization targets met
2. No performance regressions
3. Memory usage reduced
4. Code remains readable
5. Tests pass after changes

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Completed: January 2026