How many output 595 shift register I can use in series ?

thebadtall:
why should i complicate even more the board by adding one cap on each ic, instead of increasing the total capacitance of the one filter cap ?

just asking dont be insulted

Because that is the most effective means to cut down the digital switching noise from the source of the noise, at the chips, using bypass filter caps of the appropriate size, not too small or larger then needed.

Lefty