Uhhh nope I'm talking from experience. I barely had 3 systems with populations and only about 40 ships (ranging from 3000-100000 tons) when I ran out of neutronium. Mining asteroids let me keep my production going until I hit those sweet 1.0, 20mil level deposits on a system I found.
in your example asteroid mining with your own resources is only a stopgap until you can expand.
Calm down. I thought your "rule" was to never mine asteroids and just let civilians mine them. I also didn't see it as preventing me from expanding.
Now, I am concerned about the speed of my game. What are the average tech values/date/# of ships/# of colonies values?
Just making sure you can read it. Which you... apparently still didn't. Rule: Civilian mines will generally populate every worthwhile asteroid, so you can leave that to them most of the time. Exception: Sometimes you run short on a specific mineral and don't have any abundant sources, in which case you might plop down some mining colonies to grab the smaller deposits of it from asteroids while you expand to find a new long-term source.
stop·gap ˈstäpˌɡap/
noun
noun: stopgap; plural noun: stopgaps; noun: stop-gap; plural noun: stop-gaps
a temporary way of dealing with a problem or satisfying a need.
"transplants are only a stopgap until more sophisticated alternatives can work"
synonyms: temporary solution/fix, expedient, makeshift; More
substitute, stand-in, pinch-hitter
"that old plane was merely a stopgap"
temporary, provisional, interim, pro tem, short-term, working, makeshift, emergency;
caretaker, acting, stand-in, fill-in
"a stopgap measure"
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It entirely depends on what you started with. The single greatest factor in the speed of your development and growth is your starting population, everything else is secondary. There are three hard caps on growth: mineral supply, workforce requirements, and wealth. A high population directly solves the latter two and indirectly affects the first (more workers = more factories = more automines and freighters).
This is also why it's good to colonize as early and often as possible, even if you're just grabbing resourceless worlds. Every additional colony is another place for you to plop down a pop growth rate+ administrator, and even if they're not giving you minerals they serve as an R&R base as well as generating wealth, both directly and through civilian trade, which in turn allows you to build more, buy more, and invest more.
For example, my campaign right now was a low pop start (don't remember how much exactly, but it was <50m I believe) with a high base tech level, aiming for a post-apoc recovery sort of fluff. I'm 76 years into it, have only 362m pop on Earth (remember, default start is 500m) with ~1000 total factory-type facilities, 3/14 shipyards, 5 labs, 5 GFTFs, &c., but I also have 141m on Mars, 124m on Luna, and six populated colonies in three other systems with a total of 187m (and all eight of those are terraformed to 0.00 cost) with three more worlds undergoing terraforming, two in colonized systems and one in a new system, as well as a network of DSTS colonies, some my own and some captured.
So I've not researched a single tech for those 76 years (the one I started on has seen three different lead researchers and is still 27.5 years away from completion at the current rate). Keep in mind, low pop starts pretty much need high starting tech unless you want to be stuck with TL2-3 shit for decades, because labs are the second biggest consumer of workforce capacity at 1m workers a pop. It helps to remember that your workforce is ~20% of your total pop.
You're going to see roughly equal development over a timespan of ~50y from a high-tech low-pop start and a high-pop Conventional start, but the latter will always eventually outscale the former because population is king. Starting tech level only matters in the short term because it doesn't have much of an effect on your scaling; population is first in that regard followed closely by the starting minerals on your homeworld and in your starting system, then by your luck with system generation. It's vastly easier to succeed with 1b population, conventional tech, and 1x automine + 1x construction factory start than it is with 10m population, T8 tech, and a thousand/dozen of each small/large facility (not least because of the inefficiency modifiers, lol).