Setblock clocks only pulse 10 times a second

There are so many variations of redstone clocks. We need a screenshot

Added screenshot.

I have no issues with setblock clocks in my worlds.

Have you tested it in 14w32d?

Yes. I haven't found any issues.
I'm not sure how one can effectively time a clock. Furthermore, where is the evidence that says they pulse 20x / sec?
Just curious.

The most effective /setblock clock is this one:

/setblock ~ ~1 ~ minecraft:redstone_block 0 destroy

See if that works?

That didn't work either. I tested both kinds beforehand.

I tested it by hooking the clock up to a cmd block that increments a timer value by one. This value incremented 10 times a second instead of 20 times.