Even post-processing anti-aliasing puts more strain on the system. When FXAA was new and implemented on the Xbox 360 and PS3, it was set up differently to FXAA on the PC versions of the same games, as what was nearly 'free' on a PC GPU actually took several milliseconds on a console of the era, which can be a significant portion of the time allotted to render each frame. The Wii was less powerful than the other consoles of its generation, so would have struggled even more, and the WiiU wasn't a huge amount more powerful than the 360 and PS3 so might also have struggled.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
