[gib444]

I wonder if that's "App Nap"? Because there is a toggle in the Debug menu under Miscellanous Flags -> Disable App Nap on Safari Desktop

Enable debug with:

$ defaults write com.apple.Safari IncludeInternalDebugMenu -bool YES

[dawnerd]

Believe I tried that a while back and it didn’t help. Safari will reload a page as you’re using it, including filling out forms which of course it won’t save what you entered.