Document performance characteristics and benchmarks

Problem

No documentation on expected performance, latency, or throughput characteristics. Users can't make informed decisions about production use.

Missing Information

• Transaction throughput (txs/second with nonce management)
• RPC call latency expectations
• Memory usage patterns
• Impact of simulation on latency
• Batch operation performance

Recommendation

Add docs/performance.md covering:

1. Latency Breakdown

   • ENS resolution: ~X ms
   • Gas estimation: ~X ms
   • Transaction simulation: ~X ms
   • Total send latency: ~X ms

2. Throughput Limits

   • Sequential sends: X tx/s
   • With nonce management: X tx/s
   • Batch operations: X tx/s

3. Resource Usage

   • Memory per wallet instance
   • Connection pooling behavior

4. Optimization Tips

   • Disable simulation for trusted transactions
   • Use batch RPC for multiple reads
   • ENS caching recommendations

5. Benchmarks

   • Add reproducible benchmark suite
   • CI integration for performance regression

Priority

Low - Nice to have for production users

Use the requested docs/performance.md as the starting point. Define reproducible measurements for the listed latency, throughput, memory, simulation, batching, and caching areas, then connect the benchmark suite to CI. Done means the documented values and optimization guidance are backed by repeatable benchmarks and regression checks.