Yes, I know what you mean and what the other posters are describing. The funny thing is that I think very quickly, once I get set up, but it takes me a long time to get set up. That causes me problems in conversations when unexpected topics come up, and I'm expected to make a reply right away. If I just have a little time to get my memory working, I'm fine.
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"Like lonely ghosts, at a roadside cross, we stay, because we don't know where else to go." -- Orenda Fink