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The Env Vars are used to override the 'internal' defaults, so they are not normally set.
I think the default cache directory location is within the configuration directory - so, in Windows that would be c:\users\<username>\appdata\roaming\calibre\cache. I've used the Env Vars to put the configuration on my HDD Data drive alongside my libraries, and the cache is on an SSD.
Start utilities have been know to interfere with calibre's functioning - e.g. things that purport to clean up temporary files dynamically.
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