We have a lot of sites in umbraco and our biggest project by far is for a college that receives thousands (or more) requests per day.

We need your help on an important matter because we can no longer figure out what is wrong. Lately the site has been crashing or lagging a lot. The backend office takes a minute or more to open a document. The worse one is today. The entire site was filled with macro errors and normally it goes away when we refresh but I had to touch the web.config file to get rid of the error.

I was able to do a umbracodebugtrace and it was mostly a NullReferenceException. I believe it had a corrupted cache or server overload. Question is why? The server is really powerful and not in a shared environment. What else can i do to lessen the server load?

I have already done this: http://our.umbraco.org/forum/developers/api-questions/8584-Severe-Issue-with-macro-caching-under-heavy-load?p=15

but this does not work still.

this is i think what caused the error: Exception information: Exception type: NullReferenceException Exception message: Object reference not set to an instance of an object. at umbraco.cms.businesslogic.property.Property..ctor(Property property) at umbraco.cms.businesslogic.Content.

Request information:

Request path: /umbraco/editContent.aspx 

The site is using version v6.1.6

Hopefully that is enough information. If not, please let me know what other information you need from me. I have full access to the server logs. Maybe start from there.

thank you