Has there been any report of DayPilot running 5million+ script statements? I actually have everything set to use postbacks, so I'm not even sure what scripts are running.
The IE performance when loading a lot of events has been improved in the latest release (7.2):
The event loading (parsing) has been optimized and the effect is particularly visible in IE.
However, if you are displaying a lot of events on a big screen it may take a lot of time to render everything. There is some room for optimization (choosing the best loading/rendering model) but you can't beat the browser limits.
Compare the performance of the following three demos:
You can try the following: