Hi,

I'm experiencing performance problems with an Umbraco instance containing 25 sites, all running on one server.

Here's a little information:

• Content on the website itself is being delivered in a timely fashion - we've got our caching tuned pretty well.
• Back office / content editing takes the IIS worker process up to 2GB RAM usage / 80%+ CPU and hovers there indefinately, until we eventually refresh the application pool.

My questions:

• Is there any way in Umbraco to assign a separate application pool to each of the sites in an Umbraco instance?
• Does anyone have similar experiences when running an instance with 25+ sites? I'd like to compare server specs and see whether we just need more juice, or whether it is a tuning issue.
• Have Umbraco / the community published any resources on performance tuning the CMS interface side? I've found lots of good resources on tuning content delivery (mostly around caching strategies) but not much on lightening the loads for editors.

Many thank.