Factorio Forums

1) first make a backup of your desktop kappa. just a config.ini backup prob fine if you want to touch some other params.
2) go to the main menu (the one with SP/MP/continue options)
3) hold ctrl+alt and click settings button.
4) the bottom one "the-rest"
5) top right there is a search bar, to activate press CTRL+F (or) "click it" to focus over
6) type in "saving"
7) the only option left down in the panel is the non-blocking-saving. Tick it on.
8) green confirm button in the bottom of the window
9) rejoice, you have "prefer non-pausing save" enabled.
10) un-tick the said box back on the first problem to arrive (may wait centuries, really)

as a bonus, you can play around with "interface settings" group' options to feel old :>
Those are somewhat harmless.
max-map-preview-chunk-side allows you to make a map-preview smaller, for "no-spoil" or 'fast re-roll render' reasons. Sometimes also fun.
This concludes the tweak.
((You can also do this via config.ini, but you need to stop the game, edit .ini and then start the game... longer, harder, etc))