My ideas:
Delete unneeded add-ons
Get rid of un-needed programs on your computer
Close out any other unneeded programs
De-activate some music files if you've got a huge amount of them
Don't click anything while it loads (I learned that)
Click the button only once
New computer
Reinstall with no add-on back up, reinstall a few add-ons that you need
And for runtimes:
No idea but I find them annoying...
•Save builds more often