[Bugs] #4124 Write HIGH: Write-82 typing input slows down after about half a page of plain text

[Sugar Labs Bugs]

#4124: Write-82 typing input slows down after about half a page of plain text
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    Reporter:  garycmartin  |          Owner:  godiard           
        Type:  defect       |         Status:  new               
    Priority:  High         |      Milestone:  0.98              
   Component:  Write        |        Version:  Unspecified       
    Severity:  Unspecified  |       Keywords:  13.1.0, regression
Distribution:  Unspecified  |   Status_field:  Unconfirmed       
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Changes (by garycmartin):

 * cc: greenfeld (added)
  * keywords:  13.1.0 => 13.1.0, regression


Comment:

 Testing in Build 12, Write 83, XO-1.75 and XO-4 hardware:

 Write is still running very slowly once you have typed about half a page
 of text in the default font, no formatting changes. The screen gets many
 characters behind the input buffer using either the physical keyboard or
 the OSK.

 Additional testing seems to indicate that the slow down is due to the
 spelling error red under line effect (this was disabled by default in
 previous builds due to lack of language dictionaries). Due to the lack of
 any copy/paste I have often been testing by typing random letters followed
 by spaces to make filler text like paragraphs, most of which are
 underlined red, after about eight lines of text the typing slow down is
 very obvious. Typing known word spellings (no red line effect) did not
 significantly slow down text input when tested up to one page of text
 (though there was some reduction in improvement).

 Suggest disabling the red underline spelling error checks and re-testing,
 unless its performance can be improved. And certainly suggest performance
 testing with a number of larger, multipage documents, to assure we ship a
 usable word processor for school level work.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4124#comment:3>
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