No quite the opposite in fact.
It’ll have something of a flat spot at low revs but once it’s above say 1500ish rpm the turbo will be providing boost, you will have peak torque around 2k -2.5krpm and then it’ll start to drop off fairly quickly so you change up at this point.
Basically you research your engines peak torque rpm and change up around that point.
To illustrate this this is the dashboard of my Scania.
It ticks over @500 rpm is a little flat upto 1100rpm then really
really pulls well from 1100-1500rpm as this is the rev range the engine will deliver its peak torque - and efficiency - hence the green band on the Rev counter, to attain good mpg and optimal pulling performance you “keep it in the green” as much as you can.
Yes it’ll rev round to 2500 rpm but by this point your way past peak torque and just wasting fuel.
If your holding a gear you’d rev it to 2-2200rpm (the blue band) but past this point the power and torque drops away markedly.
Yes it’s a 13.6 litre engine (hence the engine speed being low compared to a smaller engine) but the principle is exactly the same for a car or van.