That's not exactly the problem though - I checked it in an actual Han game now.
The threshold doesn't actually decrease right away, so it looks like a cosmetic error - tolerable - but the next growth event is basically already free (in the sense that the food needed to grow to the next one doesn't increase - as it should).
And that becomes quite a big deal if you build a few of them.
This city has actually 10 rural tiles - which should translate to about 3 times more food needed to grow (due to the steep growth curve).
Let's put it another way: the three walls give a growth boost of more than 200% (at this point - the curve flattens a little bit later).
[Edit: This is online speed btw (to avoid confusion) - but the math should work]
The threshold doesn't actually decrease right away, so it looks like a cosmetic error - tolerable - but the next growth event is basically already free (in the sense that the food needed to grow to the next one doesn't increase - as it should).
And that becomes quite a big deal if you build a few of them.
This city has actually 10 rural tiles - which should translate to about 3 times more food needed to grow (due to the steep growth curve).
Let's put it another way: the three walls give a growth boost of more than 200% (at this point - the curve flattens a little bit later).
[Edit: This is online speed btw (to avoid confusion) - but the math should work]
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