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If you display Formats as a column that will slow things down
If you have custom columns derived from other columns that can slow things down
I think Calibre calls Mobileread when it starts - to look for PI updates
I also think Calibre calls home when it starts - to look for updates and to update its usage stats
I don't know if those features can be turned off
Is it possible that that the device where your library resides, has not spun up to speed? I have a library on a removable usb drive that's set to spin down after 10 minutes of inactivity. If I open that library (I rarely do because its its an end-of-day backup), then I have to wait 10-15 secs for the drive to spin up.
I use MSE on the same rig as you, and I exclude nothing. I have Calibre using colleagues who run AVG, Avast and ESET they also exclude nothing. Each of us experiences sub 5 sec start up times on similar rigs as your own.
Setting AV exclusions is not best practice, and these days it rarely fixes anything - a decade or more ago it might have done, especially with some better known security suites - but even they are better behaved now.
However, if you're not using a 'mainstream' AV and/or firewall solution or you have any reason to think it could be security related then - pull the plug on the internet, disable the AV and the Firewall, do a cold boot and see if that makes any difference - it probably won't but you will at least know that they are not the culprits, then turn them back on and leave them as was.
BR
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