Try this:- Menu Bar/Safari/Reset Safari......... Tick all the boxes and click Reset.
From the Finder:- Menu Bar/Hold down option (alt) key/Go/Library.......... In the resultant window navigate to Caches/com.apple.Safari........... Move files Cache.db Cache.db-shm and Cache.db-wal to Trash.
Quit Safari........ Empty Trash......... Open Safari.
Just with an idle moment or two, I downloaded Safari for Windows. My god it's fast
I normally use Waterfox but I've been having slowdown and freeze problems with it recently. I think I'll have a further play with Safari and might promote it to number one browser.
Further to this. Although I select the "Keep me logged in" type tick boxes on my usual haunts, each time I close Safari down, it forgets my login details next time I use it.