Rich edit view speed

[Andrew Hain]

I have an application with several rich edit views, and one of them is used as a running log. When two or more additional rich edit views are opened, the log slows right down; the slowdown happens in the view rather than in the code generating the log. All of the rich edit views in the application use SetSelectionCharFormat() to set character formatting; if I comment out the calls in the log, which are to colour text and underline links, it runs at full speed. Should I:

1. Optimise the calls to SetSelectionCharFormat() to remove calls that repeat the existing format or where no text is output using them?
2. Use RTF streaming instead of SetSelectionCharFormat?
3. Buffer the log instead of displaying it continuously?
4. Abandon rich edit views for another technique altogether?