Istio 0.3, we haven’t really done significant performance work within Mixer itself. This means when a request misses the sidecar cache, we spend more time in Mixer to respond to requests than we should. We’re doing a lot of work to improve this in coming months to reduce the overhead that Mixer imparts in the synchronous precondition check case.</p><p>We hope this post makes you appreciate the inherent benefits that Mixer brings to Istio. Don’t hesitate to post comments or questions to <a href="https: