I suspect that this beahvior may be related to the "history cache" of MS's SessionPageStatePersister class, used internally by RadCompression state adapter. Therefore can you please try modifing the historySize
attribute value (in the webconfig) to a more appropriate value.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.