The warning when changing thinking mode mid-conversation is now more explicit about performance impacts.
Old message: "Changing mid-conversation may reduce quality. For best results, set this at the start of a session."
New message: "Changing thinking mode mid-conversation will increase latency and may reduce quality. For best results, set this at the start of a session."
The message now mentions latency impact explicitly, helping users make informed decisions.
Evidence
Line 472714 (settings UI), line 559581 (toggle confirmation dialog), contains "Changing thinking mode mid-conversation will increase latency and may reduce quality"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.