My site is extremely slow and i frequently get errors like this...
 

I have caching set to light and I'm using "Timer" method for scheduler.
State is stored in "Page"
Module cache in "Memory"

Creating new portals always fails.

Error: Portals is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Value cannot be null. Parameter name: value ---> System.ArgumentNullException: Value cannot be null. Parameter name: value at System.Web.Caching.CacheEntry..ctor(String key, Object value, CacheDependency dependency, CacheItemRemovedCallback onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Boolean isPublic) at System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) at System.Web.Caching.Cache.Insert(String key, Object value, CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan slidingExpiration) at DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, CacheDependency objDependency, DateTime AbsoluteExpiration, TimeSpan SlidingExpiration, CacheItemPriority Priority, CacheItemRemovedCallback OnRemoveCallback, Boolean PersistAppRestart) at DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, CacheDependency objDependency, DateTime AbsoluteExpiration, TimeSpan SlidingExpiration, Boolean PersistAppRestart) at DotNetNuke.Common.Utilities.DataCache.SetCache(String CacheKey, Object objObject, TimeSpan SlidingExpiration, Boolean PersistAppRestart) at DotNetNuke.Entities.Portals.PortalController.GetPortal(Int32 PortalId) at DotNetNuke.Modules.Admin.Portals.Portals.grdPortals_DeleteCommand(Object source, DataGridCommandEventArgs e) --- End of inner exception stack trace ---

Thanks Will -

I executed the Query to delete events over 5 days old and there were 101 records effected.

I am hosting my own server on an internal network so no worries about shared hosting.

I've turned event logging down to increase performance. What type of error logging should I be looking for? Maybe I have the important ones disable? I mostly see errors like the one above.

SPA shows memory usage was busy but everything else looked cool. Newer portals with less content, less users, and fewer security roles seem to load pages much quicker.