feat: implement gas-optimized loops


**Description**
Refactor heavy loops.

**Problem Statement**
High gas usage.

**Technical Requirements**
- [ ] Batch size limit.

**Implementation Guide**
- **Suggested Approach:** Optimize iteration.
- **Affected Areas:** src/

**Acceptance Criteria**
- [ ] Gas usage stable.

**Security & Audit Considerations**
- [ ] None.

**Definition of Done**
- [ ] Performance met.