Irrlicht is like a PS2 on steroids, lots of fps, low latency, good memory access, good access to functions overloaded in the code. Great...

Unreal Engine 4 have good latency, but irrlicht it's better... but it's like PS3 vs PS4...

For the second gif I used unreal engine 4, amazing graphics, the difference lies in the amount of FPS, while irrlicht reaches me 3000 fps or more in a mid-range pc, in unreal engine 4 I run approximately a maximum of 60 FPS(vsync), that indicates an excellent optimization and excellent graphics compared to unreal engine 5, which demands too much, but with an increase in quality in the textures even better.
