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High speed capacitors



>From the book PCI hardware & software:

"However, the PCI bus specification does state that twelve 0.01 uF high
speed capacitors must be evenly spaced between the 3.3 volt and ground
layers."

What does the spec. mean with "high speed" capacitors?
e.g. the philips databook has the folowing capacitor ranges:
Class 1 NPO , Class 2 X7R, Y5V, Z5U

types of dielectric EIA/IEC, CECC:
COG/NPO/CG,
X7R/ 2R1,
Y5V/2F4,
Z5U/2E6

Who can shine a bit of light on this matter?

Eric de Jong.