As an experienced potato user, when you get too little fps to play, you can disable widgets and get lots of extra fps. It will break a lot of things, like placing mex, or in multiplayer you will get kicked for afk (widget preventing afk is diabled). There is little you can do in general apart from changing settings.
This has some workarounds, in team games you can enter comshare mode with someone so he can place mex for you and you won't get kicked as his afk widget is still working. In 1v1 you can't get kicked because of afk, so it's "safe" to use there.
Mex placement is broken in this sense that you can place mex anywhere or nowhere depending on the map. You still have to build them where metal spots used to be (you can't turn on eco overlay, widget again) so if they aren't visible on the map in distinct way you're screwed. It's playable, but barely.
I've lost a winning game with disabled lua due to Artemis not having auto-queued stockpile (widget). My superweapon was bombed with idle Artemises all around. In big matches when you can't play and noone wants to comshare you can always resign, disable lua and still have some pleasure of watching the game with decent fps.
The command to disable lua:
To return back to normal type "enable" instead. Command with "reload" instead disable is useful to fix occasional ui glitches.