Some of you may already know about this, but here itis, just for the record:
It's important to understand that the speed of DFD AF relies on much more than sensor readout speed and processing power. Algorithms are important, and sometimes discoveries are made that improve things in a dramatic way. 3 years ago, a youtuber named YodaYeo discovered that AF on the GH5 improved dramatically by reducing the shutter angle slightly, the 179 degree theory. The latest of the videos below suggests that Panasonic took action on this, but it's interesting to see how rather simple, and in this case coincidental discoveries can make a lot of difference, even when the hardware stays the same.
Here's YodaYeo's orginal video about the subject:
Here's his explanation about how and why it works:
Here are Gerald Undone's comments:
Here's Gerald Undone again, this time saying that Panasonic appears to have been looking into the matter, making the 179 degrees shutter angle less of an improvement: