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* By default, the conversion rates start at 90% for regular, 60% for ultimate, and 40% for god.
* With ICU, those starting rates are 115%, 85%, and 65%.
* Each level of a module adds 1% to that type of crystal's conversion rate. (No cap on this gain for any of the four regular crystals, but ultimate and god can each only gain up to 25% from this.)
* The above numbers are for converting grade 1s. Subtract 5% from the total for the rates when converting grade 2s. And again for the next grade. And again after that. And so on.
* Conversion rates are constrained within a range of 5% to 95%. Anything higher than 95% (like that 115% I just mentioned) will be treated as if it's 95%. And once you start dipping below 5% in a rate it'll just treat that as if it's 5%.
If you click the "info" button on the crystal factory it explains with an example how a conversion rate is actually used.
In that example, we're looking at 8 of the grade 1 ultimate crystals, we do not have Improved Crystal Upgrade, and we're ignoring the effect of module levels. So the conversion rate is 60%. Multiply 8 by 60% and that's 4.8. Round that down to 4 and that's how many grade 2 ultimates you end up with.
Suppose we look at that example again, but this time we do have ICU. Now the conversion rate is 85%. Multiply 8 by 85% and that's 6.8. So we end up with 6 grade 2 ultimates.
Take either of those cases and factor in a level 3 ultimate module. Without ICU, the conversion rate is 63%. 8 times 63% is 5.04, so we end up with 5 grade 2s. Or with ICU, the conversion rate is 88%. 8 times 88% is 7.04, so we end up with 7 grade 2s.
We don't see these steps up from the example's baseline of ending up with 4 grade 2s without ICU / ending up with 6 grade 2s with ICU until the 3rd level of the module. Any lower and you still end up rounding down to the same thing. Likewise, module levels above 3 will see no further step up in the results until you reach a certain level since they'll just keep rounding down to the same thing. You'd need a 75% conversion rate (no ICU, level 15 ultimate module) for 8 grade 1s to become 6 grade 2s. And... Well getting 8 back from 8 will be impossible since you'd need a 100% conversion rate (with ICU that's a level 15 ultimate module) and that's just going to get treated as a 95%.
The example didn't go into converting those grade 2s into grade 3s, but as I mentioned it subtracts 5% from whatever rates you were dealing with for the grade 1s. So in the base example where the rate was 60% and you ended up with 4 grade 2s, now you're applying a 55% rate to upgrade those 4 grade 2s into 2 grade 3s. (4 x 0.55 = 2.2, which rounds down to 2). Now go back and factor in that level 3 ultimate module and we're dealing with upgrading 5 grade 2s at a 58% conversion rate, and that ends up also making 2 grade 3s. (5 x 0.58 = 2.9, which rounds down to 2). You'd need a better level on the module than that to bump up the result in the grade 3s. But then it's entirely possible that that distinction will be lost in the next step when converting your grade 3s into grade 4s, and you'd need an even higher level on the module to see a better result in the grade 4s.
Don't get me wrong. ICU certainly does help. You're delaying how high of a grade you need to be dealing with before the conversion rates (ignoring module level) reach 5%. The thing is that it's just one part of a big complicated process that tends to be inefficient anyway.
Some upgrades you may need to save/load or open/close the game for them to properly take effect.
If you want to test it out without losing the pet stones, Save locally, save online, copy your manual save to a different location, then buy it and save and load locally. You'll have 15 minutes before the online save triggers again, and if you don't like it, load the online save.
This does make a huge difference to the number of crystals you need. With a Lv25 factory it goes from 9.4B to 3.8M for a grade 30 basic crystal. You can get another 5% bonus with Challenge points, that brings it to 420k.
Since there is a small bug, that the max tooltip only changes when you created new crystals, not when you upgrade modules or buy ICU ... aka, did you really tried hitting max before and after buying it? (and reloading after hitting it ofc)
edit: oh, wow, why didn't Steam show me the other answers sooner?
I've been noticing that over the last week or two. It'll just randomly decide not to bother loading replies. You might be able to get it to load properly, sooner or later, if you reload the thread a dozen times. I have no idea why it's been like this though.