EOS 5D Mark IV: frame rate

The EOS 5D Mark IV features a maximum frame rate of 7fps. If you need to achieve the fastest frame rate possible but are finding it slower than you expect or need, check your camera settings. Most notably, the Digital Lens Optimizer setting. With this turned to Enable, the frame rate will greatly reduce, especially in conjunction with Dual Pixel RAW. Turning either, or both, of these two settings to OFF will dramatically increase your frame rate.
Camera settings
EOS 5D Mark IV