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Unfortunately, you have not yet clearly differentiated your performance data between "Calibre the Program" and "Calibre's Last-Used Library".
Run Calibre. Create a new, fresh, empty Library, and switch to it. It is now your "last-used Library" that Calibre the Program will automatically load upon startup. Exit from Calibre immediately. Reboot your PC. Run Calibre. What happens when Calibre the Program loads your empty Calibre Library? How does its performance differ from that you have stated in your previous posts? If the performance has not drastically improved, then your problem is not with your Calibre Library folder, which is totally new and empty, and therefore is as small as it gets. If the performance is identically awful, then it is either hardware or related to how your Calibre program has been installed, including the temporary file folder that you have told Windows to use in general, or for Calibre to use within Windows. Check your environment variables for Windows for Temp, Tmp, and also any specific to Calibre. Also clean your Drive C: using "Disk Cleanup" within Windows, including all System Files (including Windows Update). Then defragment/optimize C:. Reboot, run Calibre (still with the "empty" Library as the "last-used library" to keep that variable constant for this test), and compare its new performance to the prior performance. What, if anything, has changed?
DaltonST
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