Like Razvan has mentioned, the main culprit is here https://searchfox.org/mozilla-central/source/devtools/server/actors/inspector/utils.js#132. We call nodeHasSize() for every text nodes to show an indicator in the markup view if the whitespace text node has an impact on the layout. One idea would be to set a pref for this check meaning the platform team can turn this off. How would people feel about that?
Bug 1567310 Comment 3 Edit History
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Like Razvan has mentioned, the main culprit is here https://searchfox.org/mozilla-central/source/devtools/server/actors/inspector/utils.js#132. We call nodeHasSize() for every text nodes to show an indicator in the markup view if the whitespace text node has an impact on the layout. One quick fix would be to set a pref for this check meaning the platform team can turn this off. It would mean the platform team would need to know about some obscure prefs for their development in the future. How would people feel about that?