In my application, rdlc reports render very slow. Previously I had FW 4.0 and version 10 of the ReportViewer. There is a bug in expression host for reports running in the sandboxed domain in FW 4.0. The solution was to use legacy CAS security by setting
NetFx40_LegacySecurityPolicy to true. Somewhere I read that the issue goes away when migrating to FW 4.5 or later, and it sounds logic to me. But now that I migrated to FW 4.6.1 and ReportViewer 12.0 the issue is still present. Of course if I activate the
legacy CAS policy everything is fine but this is not an option to me. Is there a way, in FW 4.6.1, to get the reports rendered without this performance penalty and without having to activate the legacy CAS policy?
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