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[GhostDwemer]

More flowing water equals less FPS. One thing I've noticed on major rivers is that when the river exits the map right after a turn, you will always have a large patch of water under 7/7 and your FPS will suffer. A river that exits on a straight will have a smaller patch of low water.

I thought I would use this to my advantage, to make a fort on a really impressive waterfall. I found a major river with stream falling into a straight section. The river exit squares were filled to 4-5/7, and I got 100 FPS solid, until the spring thaw. Now I have a huge patch of low water, the river exit squares are all 1-2/7 and my FPS just fell to 60. There could be ambushers on the map, but I've never seen that big a FPS hit before.

[Michaelsoftman]

Last time I embarked on a major river, I pumped magma up to the end where the water flows off the map and sealed it off completely.

I regained like 50 fps.

[GhostDwemer]

You know, I actually thought about that. The fort was coming along nicely in the first year. But, nah. I will just find a river in a warm biome. Or, more likely, give up on major river embarks until I can afford a better computer.

[SuicideJunkie]

Why not wait for winter, then put some floodgates in at the downstream edge?
After the spring thaw, you can let the river fill up to solid 7's before letting it flow again.

[GhostDwemer]

Honestly? Because it breaks the realism too much for me. I like to imagine dwarves trading with human ships on the river. I was going to build docks. I guess I could rationalize it as locks or... actual floodgates on a river isn't unheard of, it's kind of why they call them floodgates. Yeah, I could do that. It's only a twenty square wide river and it's frozen for a month.