Yes, it takes a while for your supply network to respond, depending on how far from your capital they have to go and how many supplies get through. This is influenced by the 2 supply techs in the theory tab and the infra of your provinces. Just for the sake of being complete, here is how it works.
Supply travels from your capital through each province until it reaches the frontlines. In every province, a little bit it lost (this is supply tax). How much reaches the next province is the supply throughput. Partisans, revolt risk, dissent, infra, techs, number and types of units involved, generals with Logistics Wizard trait, all affect this. If you look at the supply mapmode, the colours are these:
green: plenty of "space"", no problems. The brighter the green, the better.
blue: surpluss of supplies.
brown: no supplies getting through. See above for possible causes.
any other colour: varying shades of bad to worse.
You can get a tooltip by hovering your mouse over a province in this mapmode.
In other words, let's say you have taken Korea from the Japanese and you want to sent supplies via convoy. These go from Nanjing to, let's say, Shanghai. Small distance, so not too much should be lost along the way. If you have the convoys assigned, then convoys will take them to Korea. From the Korean port, they will travel over land to the frontline. As you can see, if you're fighting on the other side of the Soviet Union, it might take a long time for supplies to catch up.
edited to add: if you are assigning ports manually, you will also have to assign the convoys and possibly escorts to the route.
Supply travels from your capital through each province until it reaches the frontlines. In every province, a little bit it lost (this is supply tax). How much reaches the next province is the supply throughput. Partisans, revolt risk, dissent, infra, techs, number and types of units involved, generals with Logistics Wizard trait, all affect this. If you look at the supply mapmode, the colours are these:
green: plenty of "space"", no problems. The brighter the green, the better.
blue: surpluss of supplies.
brown: no supplies getting through. See above for possible causes.
any other colour: varying shades of bad to worse.
You can get a tooltip by hovering your mouse over a province in this mapmode.
In other words, let's say you have taken Korea from the Japanese and you want to sent supplies via convoy. These go from Nanjing to, let's say, Shanghai. Small distance, so not too much should be lost along the way. If you have the convoys assigned, then convoys will take them to Korea. From the Korean port, they will travel over land to the frontline. As you can see, if you're fighting on the other side of the Soviet Union, it might take a long time for supplies to catch up.
edited to add: if you are assigning ports manually, you will also have to assign the convoys and possibly escorts to the route.
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