Don't try to parse strings that don't contain blocks #3903
Merged
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Description
As reported in #3799, parsing long strings that don't contain blocks cause significantly increased memory usage.
As ~100% of posts published prior to the release of WordPresss 5.0 fit this description, it's worth adding a special case to bail early, before even trying to parse the unparseable.
How Has This Been Tested?
Creating a post in the classic editor with this sample data, viewing the post, and observing memory usage under different conditions:
With Gutenberg disabled: 4.5MB, ~0.1s
With Gutenberg
master
enabled: 46.1MB, ~0.3sWith this PR enabled: 4.6MB, ~0.1s
Checklist: