This book constitutes the refereed proceedings of the 17th TPC Technology Conference on Performance Evaluation and Benchmarking, TPCTC 2025, held in London, UK, at September 1, 2025.The 10 full papers included in this book were carefully reviewed and selected from 18 submissions. The proceedings also feature two invited papers and a panel discussion led by industry and academic leaders. The accepted papers span the following subject areas:Core Database BenchmarkingAI/LLM-Related BenchmarkingData Generation and AugmentationSystem/Hardware Optimization and Sustainability