[PD] is bang~ limited to a 64 sample block?

[hard off]

I made a patch which times the duration between two bangs sent by [bang~].
If i set the blocksize to the default of 64, then each bang comes 1.4ms
apart - as expected with 44.1khz samplerate.

However, making the blocksize smaller has no effect on the duration between
the bangs.

Does bang~ have a speedlimit of 64 samples?  If not, what is the limiting
factor stopping me getting bangs more often than every 1.4ms?

(test patch is attached)
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