I did increase it to 20,000. I am working on a project and rather than letting it go above 10,000 (watching it in the processes tab of Task Manager) I saved the project and restarted Vegas to get that value back down. For example, before I started a render, I restarted. May not have been necessary, but I had a deadline and figured it was quicker to restart Vegas than to waste time if the render failed half way through.