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Detailed Bezier Curves get decimated with higher curve resolution
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This is how things look with Curve Resolution set to 12

This is how things look with Curve Resolution set to 3

As you can see, the part where there's more points per Blender Unit get decimated - loose detail - when the curve resolution is higher.
I'd expect quite the opposite. The less detailed parts of the curve behave as expected.

Event Timeline

Luca Rood (LucaRood) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Dec 10 2016, 1:02 AM

There isn't enough information to reproduce this.

Please provide detailed steps on how to reproduce this, and an example .blend file where this occurs.

Also, what version of Blender are you using? Does this occur in the latest release from (2.78a)?

I've now tested it with a nightly build of 2.78.4 from 8 Dec 2016.
I also created this test file with it.

I've noticed that this only happens for extruded curves. Setting the "Extrude" to 0 removes the decimation effect. 2D and 3D curves behave the same.

Here's a simple project that demostrates this effect:

Open it up and change the Preview U from 1 up to 64 and watch what happens to the generated mesh. Here's screenshots from what you should see:

U = 1

U = 15

U = 64

And now with the curve control points overlay (edit mode):

This didn't happen until I subdivided the curves quite a lot - the more points the curve has, the worse the decimation that happens for high U values.

Bastien Montagne (mont29) raised the priority of this task from Needs Information from User to Normal.

@Luca Rood (LucaRood) mind checking the report again please? thanks :)

Hm, oddly my email didn't notify me about this task being updated...

But anyway, this behavior is indeed odd. I'll look into this issue :)
In the mean time, @João Araújo (genio84) might know something about this?