Efficient solutions respect both platform limits and budgets. We cover how to design within governor limits, organize code and packages for performance, and manage data lifecycle. On the cost side we look at TCO modeling, build-versus-buy decisions, and licensing and sandbox optimization. We also cover the new economics of agents: tokens, consumption-based pricing, and measuring the work agents complete rather than just the resources they burn. You'll leave with ways to make cost a design input rather than a surprise on the invoice.