Well, a startup delay is different to a delay when changing Views or doing a search. There may be other features in MC that access drives to check stuff. I haven't looked.
It probably depends to a large degree on how you have connected your seven network drives, the router, switch (if any), controller in the enclosures you are using, particularly if they are all individual network drives, rather than a NAS or server of some type. Windows can take a very long time to spin up and recognise drives, or even just switch to drives. Windows 10 seems to have become even worse than earlier versions, in some situations. Even the Downloads directory on my internal SSD boot drive can take fifteen seconds to scan and show files, I assume because Windows now considers that an unsafe location or something. I haven't investigated yet.
Maybe explain a bit more about your seven drives, the enclosures you use, the network type (ethernet/WiFi) and speed you have, and so on. There may be something you can do.
Also, if you have customised Views, maybe some of the expressions you have used take some time to process.
As a comparison, I have five internal media hard drives in my HTPC, and response at startup and on all Views is very quick, with some 27,500 audio files, 6,500 TV shows, and 1,300 movies.