This paper deals with the development of innovation capabilities inside industrial cluster firms and discusses the relationship between: firms networking with other firms and external partners inside their clusters; and the effects of this networking on the innovation performance of the cluster firms. The paper reports findings from a research study conducted in China's Zhejiang Province, where 212 out of 336 enterprises based in six industrial clusters responded to our questionnaire survey. Our study shows that 'strategic networking' inside clusters improves both product innovation performance and overall speed of the innovation process inside technology-based SMEs, which ultimately effects competitive performance.