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ISS is currently making morning passes.
Define VERY bright and VERY fast. ISS magnitude varies with altitude and Sun illumination and is often around -2 to -3 mag but can be brighter at zenith and optimal sun angle. It also takes many minutes to cross when at a good altitude (6-8 minutes or so). I would not call this VERY fast, but as to VERY bright it can be brighter than Venus during an optimal pass and for that the term VERY may be appropriate.
I would not call any satellite pass as being VERY fast but it comes back to your definition of VERY, 6-8 minutes to cross or 6-8 seconds to cross? If it was only a few seconds then back to the possibility of it being a meteor.
You say it was through high cloud so the possibility of seeing a meteor trail is substantially reduced which means it still could have been a meteor in which case both VERY bright and VERY fast may apply.
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