# Task 14: Performance and Load Testing Framework

**Date**: 2025-01-18  
**Status**: ⏳ **FRAMEWORK READY** (Deferred until system operational)  
**Priority**: 🟢 LOW

## Overview

Performance and load testing framework for the cross-chain bridge system to ensure it can handle production loads.

## Testing Objectives

1. **Throughput**: Measure transactions per second (TPS) capacity
2. **Latency**: Measure end-to-end transfer time
3. **Gas Efficiency**: Measure gas costs under load
4. **CCIP Performance**: Measure CCIP message processing time
5. **Concurrent Load**: Test system under concurrent transaction load
6. **Resource Usage**: Monitor resource consumption (if applicable)

## Test Categories

### 1. Throughput Testing

**Objective**: Measure maximum transactions per second

**Test Scenarios**:
- Single direction transfers (Mainnet → ChainID 138)
- Bidirectional transfers (both directions simultaneously)
- Single bridge (WETH9 only)
- Both bridges (WETH9 and WETH10 simultaneously)

**Metrics**:
- Transactions per second (TPS)
- Successful transaction rate
- Failed transaction rate
- Average confirmation time

**Method**:
1. Send N transactions at rate R TPS
2. Monitor successful vs failed transactions
3. Measure time to completion
4. Calculate actual TPS

**Target**: System should handle at least 10 TPS

### 2. Latency Testing

**Objective**: Measure end-to-end transfer time

**Test Scenarios**:
- Mainnet → ChainID 138 transfer time
- ChainID 138 → Mainnet transfer time
- Round-trip time (Mainnet → ChainID 138 → Mainnet)

**Metrics**:
- Time from transaction submission to on-chain confirmation (source)
- Time from CCIP message to destination confirmation
- Total end-to-end time
- CCIP message processing time

**Method**:
1. Submit transaction and record timestamp
2. Monitor until destination chain confirms
3. Calculate time difference

**Target**: End-to-end transfer < 30 minutes (CCIP dependent)

### 3. Gas Efficiency Testing

**Objective**: Measure gas costs under various conditions

**Test Scenarios**:
- Single transfer gas cost
- Batch transfer gas cost (if supported)
- Gas cost with different amounts
- Gas cost variations with network congestion

**Metrics**:
- Gas used per transaction
- Gas price (gwei)
- Total cost (ETH)
- Cost efficiency (gas per WETH transferred)

**Method**:
1. Execute transactions and measure gas used
2. Record gas prices at time of execution
3. Calculate costs

**Target**: Optimize gas usage while maintaining security

### 4. CCIP Performance Testing

**Objective**: Measure CCIP-specific performance metrics

**Test Scenarios**:
- CCIP message submission time
- CCIP message confirmation time
- CCIP fee calculation accuracy
- CCIP message retry handling

**Metrics**:
- CCIP message ID generation time
- Time from message submission to confirmation
- CCIP fees paid
- Message delivery success rate

**Target**: CCIP message confirmation < 15 minutes (CCIP SLA dependent)

### 5. Concurrent Load Testing

**Objective**: Test system under concurrent transaction load

**Test Scenarios**:
- 10 concurrent transfers
- 50 concurrent transfers
- 100 concurrent transfers
- Mixed transfers (both directions and both bridges)

**Metrics**:
- Successful completion rate
- Average completion time
- Transaction ordering (if applicable)
- System stability under load

**Method**:
1. Submit N concurrent transactions
2. Monitor all transactions to completion
3. Measure success rate and timing

**Target**: 95%+ success rate under moderate load (50 concurrent)

### 6. Stress Testing

**Objective**: Test system limits and failure modes

**Test Scenarios**:
- Maximum concurrent transfers
- Large amount transfers
- Rapid fire transactions
- Network congestion simulation

**Metrics**:
- System behavior at limits
- Failure modes
- Recovery behavior
- Error handling

**Target**: Graceful degradation, clear error messages

## Performance Benchmarks

### Expected Performance

| Metric | Target | Acceptable | Notes |
|--------|--------|------------|-------|
| **Throughput** | 10+ TPS | 5+ TPS | Limited by CCIP |
| **Latency (Mainnet → 138)** | < 15 min | < 30 min | CCIP dependent |
| **Latency (138 → Mainnet)** | < 15 min | < 30 min | CCIP dependent |
| **Gas Cost (Transfer)** | < 200k gas | < 300k gas | Variable with congestion |
| **Success Rate** | 99%+ | 95%+ | Under normal load |
| **Concurrent Capacity** | 50+ | 20+ | Simultaneous transfers |

### CCIP-Specific Benchmarks

| Metric | Target | Notes |
|--------|--------|-------|
| **CCIP Message Time** | < 15 min | Depends on CCIP network |
| **CCIP Fee** | Variable | LINK token required |
| **CCIP Success Rate** | 99%+ | CCIP network dependent |

## Testing Tools

### 1. Foundry/Forge

**Use**: Automated testing scripts

**Scripts**:
- `test/performance/LoadTest.t.sol` - Load testing
- `test/performance/GasBenchmark.t.sol` - Gas benchmarking

### 2. Cast Commands

**Use**: Manual testing and monitoring

**Commands**:
```bash
# Monitor gas usage
cast send --rpc-url $RPC_URL --private-key $KEY \
  --gas-limit 500000 \
  0x3304b747E565a97ec8AC220b0B6A1f6ffDB837e6 \
  "sendCrossChain(uint64,address,uint256)" \
  $SELECTOR $RECIPIENT $AMOUNT

# Monitor transaction status
cast tx <TX_HASH> --rpc-url $RPC_URL
```

### 3. Custom Load Testing Scripts

**Use**: Concurrent transaction testing

**Language**: Node.js/TypeScript or Python

**Features**:
- Concurrent transaction submission
- Metrics collection
- Reporting

### 4. Monitoring Tools

**Use**: Real-time monitoring during tests

- Etherscan/Block Explorer
- CCIP Explorer/Monitoring
- Custom monitoring scripts

## Test Execution Plan

### Phase 1: Baseline Testing

1. Single transfer performance (both directions)
2. Gas cost baseline measurement
3. CCIP performance baseline

### Phase 2: Load Testing

1. Throughput testing (5, 10, 20 TPS)
2. Concurrent transfer testing (10, 50, 100 concurrent)
3. Mixed load testing (both bridges, both directions)

### Phase 3: Stress Testing

1. Maximum load testing
2. Edge case performance
3. Failure mode testing

### Phase 4: Long-Term Testing

1. Extended duration testing (24+ hours)
2. Sustained load testing
3. Monitoring for degradation

## Test Data Collection

### Metrics to Collect

- Transaction hashes
- Gas used
- Gas prices
- Timestamps (submission, confirmation)
- CCIP message IDs
- Success/failure status
- Error messages (if any)

### Reporting Format

```
Performance Test Report
Date: YYYY-MM-DD
Test Duration: X hours
Total Transactions: N
Successful: M (percentage)
Failed: F (percentage)
Average Latency: X minutes
Average Gas Cost: X gwei
Peak Throughput: X TPS
```

## Dependencies

### Prerequisites

- ✅ Bridge destinations configured
- ✅ Test accounts with sufficient funds
- ✅ LINK tokens for CCIP fees
- ✅ Monitoring tools access

### When to Run

**Recommended Timing**:
- After bridge configuration complete
- After initial integration testing (Task 4) passes
- Before production deployment
- During scheduled maintenance windows

## Current Status

**Status**: ⏳ **DEFERRED**

**Reason**: Performance testing should be done after:
1. Bridge configuration is complete (Task 7)
2. Cross-chain integration testing passes (Task 4)
3. System is fully operational

**Framework**: ✅ **READY**

The testing framework is documented and ready to execute when the system is operational.

## Recommendations

1. **Start with Baseline**: Run baseline tests first to establish performance metrics
2. **Gradual Load Increase**: Gradually increase load to find system limits
3. **Monitor CCIP**: CCIP performance is a key dependency
4. **Document Results**: Keep detailed performance records
5. **Compare Over Time**: Track performance metrics over time

## Future Enhancements

- Automated performance regression testing
- Continuous performance monitoring
- Alerting on performance degradation
- Performance optimization based on results

---

**Status**: ⏳ **FRAMEWORK READY - DEFERRED UNTIL SYSTEM OPERATIONAL**
