Textarea lag

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i have textarea using main output window mud (multi-user dungeon). wrote parser handle ansi colors , turn them html formatted text. working great, however, once textarea has lot of formatted text in it, becomes sluggish. if clear textarea, goes normal. question is, there better way handle lot of formatted text program wont become sluggish?

virtualize how text display.  that's why datagrid , list don't

make renderer non-visible rows.



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