Assuming the temp is not too far above ISA, comfortably 2000fpm+ up to around FL120, and 1500fpm to max cruise at FL250, taking maybe 12-13 minutes or so. Max cruise is 360kts TAS.
Empty, it has a ridiculous rate of climb, almost 6000fpm initially and FL250 in 6 mins. Apparently.
In the descent, we're restricted to 245kts IAS below FL80, but up to that point 285kts IAS from around FL200 and below.
For a TP, it's a hoot to drive. Even with the powerplant derated to less than 5000shp it's ridiculously overpowered for what it needs to do.