This volume presents cutting-edge research in performance engineering from two major European workshops. The papers, carefully selected from numerous submissions, cover a broad spectrum of topics including classical performance modeling, wireless network protocols, parallel execution of scientific codes, energy-aware computing, and novel applications such as ranking professional tennis players. The collection highlights new techniques for addressing the modeling challenges posed by increasingly complex and large-scale systems, alongside fresh case studies.

The collection offers a comprehensive overview of current research in performance engineering, reflecting the diverse interests and challenges within the field. The inclusion of both established and emerging topics suggests a valuable resource for researchers and practitioners seeking to understand and improve system performance. The dual workshop format ensures a broad geographical and thematic scope, providing insights from different research communities. The papers collectively address the growing complexity of modern systems, offering both theoretical advancements and practical case studies.