My Oracle Support published the IP14 revision for the “it-should-be-well-known-by-Siebel-folks” Siebel Open UI Deployment Guide.
Among others the guide provides a reference to a catch-all article related with Internet Explorer performance issues with Open UI.
Microsoft is being challenged by a number of Oracle (Siebel) customers to resolve the major performance bottlenecks. And… Microsoft apparently did pick up on this, and are working towards fixing the known performance limitations! No guarantees can be given, but an IE11 patch is to be expected in the coming months 🙂