We currently have our intranet running on umbraco 7.5.3 with 11 language branches and in total about 21000 pages. Our intranet is growing continuously. We use about 400 Member Groups/Roles with a few thousand users. The roles are synchronized with our active directory. In our current umbraco 7 version IIS is stable and pages are served in 10-20 ms which is acceptable.

We want to migrate our intranet to Umbraco 8 but we experience serious performance issues when using the Member Group Roles on the pages. This is a breaking issue for us. When we have our database without roles then pages are served in 5-10ms and the website and IIS are stable.

When we add roles to the pages via Public Access (about 4000 pages with about 15000-20000 roles in total) the serving of pages start at about 60ms. After 10 minutes (about 2000-3000 pages) time goes to 400-600 ms per page and after 30 minutes pages take more than 1200ms to load. Even pages without protection take 500ms-600ms or more. Every page loads slower and IIS memory goes up to 1500-2000Mb after 15-30 minutes. The inital IIS memory starts at about 250MB in the task manager.

To replicate this, we used the Demo website in umbraco 8 and added a few hundred pages to the 'About us' section and added roles to those pages.

We use a console application with WebClient for the performance test and for the authorized pages we use WebClient with a CookieContainer.

Next to the problem above, there seems to be an issue with the maximum number of roles that can be added to a Page. This seems to be dependend of the total concatenated string of all the rolenames that are added to it. No more roles can be added when the total rolenames exeed a length of about 1024 characters. When there are about 15 roles of 90 characters no more roles can be added.

We can provide you with a copy of the database so that you can reproduce the problem on site.

Best regards, Ferdy Roos