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yes, it's called transient response (often mistakenly called 'lag') and it does decrease with engine RPM...as well as other changes that can be made. You get the same effect when you put larger cams on an NA engine or a large plenum intake manifold (for power).
Response isn't shown on a typical dynograph but 'lag' is.
You may also want to check out some newer turbo tech. Both turbine and compressor 'response' technology have made large gains since Toyota use to poke around with turbos. Nothing you can do about gas pressurizing, as it will always be there, but reductions in weight and geometry gains make for spool up at lower exhaust pressure = faster spool up on the compressor = shorter transient response. The better geometry also means that they flow more for the same given transient response or vice versa.
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