You'll notice
Useful2 Signal1
Loading a session's transcript skips an extra filesystem check, so it opens a little faster.
What's wrong with this entry?
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What
Finding a session's transcript used to also read the file's modification time and attach it to every loaded message. Both the extra filesystem call and that field are gone, so the lookup now returns only the key and path.
Evidence
sessionFile: i.path
Strings lifted out of the shipped bundle, so the claim above can be checked against them.