XPS 15 9560 POWER throttles (no thermal throttling)

It is not easy to tell if the laptop is performing reasonably well. CPU temperatures above 90 degC are not normal, indicate a cooling problem, like dust-clogged fins or another heatsink problem. Unfortunately, XPS 15 often benefit substantially from CPU&GPU repasting. Many user photos of heatsink dismounting show too much remaining thermal paste on the dye/sink, indicating that the gap was too thick, sometimes uneven due to misalignment.

Unfortunately, power limit throttling is normal for XPS 15, even with a well-attached heatsink, because the cooling capacity of the heatsink is inadequate for the high-spec CPU and GPU. In particular, the voltage-regulator area is not cooled actively and overheats after sustained combined CPU+GPU load, for instance in certain games and GPU-intensive programs.

I find it very unfortunate that the nominal long-term cooling capacity is not declared in the specifications, because users tend to expect that a laptop would be able to make use of the specced components without restrictions.

I find it even more unfortunate that the power limit throttling (presumably implemented with Intel DPTF) kicks in instantly, causing a sudden rapid drop of performance, rather than smoothly reaching a thermally sustainable performance within the thermal constraints.