How can i change the colour of key words in long text fast ?

Hi,
I have long text (for example script) which should be displayed in TextArea (or something similar) with colored keywords.
I tried with TextRange
new TextRange (myTextArea, true, start_Index, stop_index)
and with
RichEditableText
var highlightFormat:TextLayoutFormat = new TextLayoutFormat();
highlightFormat.color = 0xFF0000;
for each (var currentKeyword:String in keyWords) {
myRichEditableText.setFormatOfRange(highlightFormat, indexOfKeyword, indexOfKeyword + currentKeyword.length);
Either ways are too slow, 30 sec....
The indexes of words which should be colored are computed below a second but creating an object for every keyword is too expensive .
Any Idea what should i do ?

There are a couple of things you can do. Check out the PS Touch tutorial, "Replace colors," as one example.
You can optionally use the other selection tools in lieu of the Magic Wand selection tool.
Also, you can use the Paint Tool's effects options in conjunction with any of the selection tools. Many common effects and adjustments (like "Color Balance" in the PS Touch tutorial) are available by tapping the Mode option and choosing, "Effect," rather than, "Paint."

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How can i change the colour of key words in long text fast ?

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