[racket] editor%

Hello

I have wrote little program with editor-canvas% but it is terrific slow for
big text log file loading.
So my question is,
Why is the Racket Editor (DrRacket or mred/edit demo) so slow when loading
big text file (over 1.5Mo) even for non colorized text?

Scite ou Geany or Java Eclipse load my 1.2Mo bookmark HTML with syntax
color in ~1 second where Racket take up to 20 or 30 seconds

thank's
     Yvan
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