LT8315 non-isolated application decoupling capacitor

Hi, support team

I'm evaluating LT8315 non-isolated circuit on page 21 Figure 9.

After applying Vin, I want this circuit to start up ASAP.

The IREG/SS capacitor is effective for the slope, but does not seem to be effective for the rising start point.

The INTVCC and BIAS capacitor seems to be effective. How small can these be?

INTVCC capacitor is written as 2.2uF in p.7.

Please tell me the allowable value for BIAS.

Best regards,

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