microsoft / microsoft/XmlNotepad

Becoming Extremely SLOW when handling large (~100MB) file

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Dominant language
C#
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Description

Hello,

I explored almost every XML editors and feel that XML Notepad is the BEST OF BEST, really thank you Mr. Chris Lovett.
Recently, I started to handle huge (around 100 MB or more) XML file, and experiencing very slow response from XML Notepad, showing 'no response from application' via Windows Task Manager.
BTW, Windows Resource Monitor also saying that XML Notepad is using less than 10% of CPU (I saw only 1 or 2 CPU core are busy among 16 cores), and also uses around 15% of memory, and very low disk % usage of my PC.

Is there any possibility to speed up the application by using multi-core and more memory allocation ?
(As we know latest computers are having large enough CPU core count and memory capacity...)

Thank you for valuable reply in advance... FYI, I attach big sample XML.

sample.zip

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First steps

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Research direction

Start by reproducing the slowdown in XML Notepad with the attached sample.zip and observe its behavior while opening or editing the large XML file. Determine what measurable responsiveness improvement would count as done; the issue does not identify a source file, test, or specific entry point.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
desktop, performance
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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