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Wikidata: Wikimedia Error in loading diffs of big pages
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Description

Hi all! In the last weeks I've often experienced this error

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PHP fatal error:
entire web request took longer than 60 seconds and timed out//

when I tried to load a diff on pages bigger than 400000 bytes. Examples: https://www.wikidata.org/w/index.php?title=Wikidata:Database_reports/Constraint_violations/P301&diff=923287757&oldid=910429669, https://www.wikidata.org/w/index.php?title=Wikidata%3ADatabase_reports%2FConstraint_violations%2FP301&type=revision&diff=923287757&oldid=907115544. It's very annoying when trying to see diffs in big Constraint reports.

The same problem doesn't happen e.g. on Italian Wikipedia. Examples: https://it.wikipedia.org/w/index.php?title=Storia_dell%27antico_Egitto&diff=103720225&oldid=103073527, https://it.wikipedia.org/w/index.php?title=Storia_dell%27antico_Egitto&type=revision&diff=103720225&oldid=97606863.

Maybe this problem can be compared to that of https://phabricator.wikimedia.org/T221380.