The Visio Team recently released the Visio Services 2010 performance and capacity planning white paper. This white paper addresses the impact of SharePoint farm topology on Visio Services. It also explores how various service settings can affect latency and throughput. The white paper examines both typical and high stress conditions, which should help you better scale your deployments based on the number of users you need to support and their expected usage.
As usual, please comment on the blog if you have any questions or comments to share.