Welcome to our community.
This is a known issue and our team is looking into it. We had a few reports about it in our performance feedback thread here:
Our community has found a temporary workaround for this issue, that is either upgrading the internal hard drive of the PS4 Pro to a SSD drive, or installing the game on an external USB SSD drive.
While this is not an ideal situation, it could be useful while our team is working on this problem.
Thanks for your feedback.
Welcome to our community. Could you let us know around which areas are you experiencing this problem more frequently?
Our tech team is running some tests trying to pinpoint the cause for this problem so the more information we can give them the better.
Thanks
Welcome to our community.
Thanks for sharing your findings. Unfortunately, other users have reported this recently too (i.e here: External Drive Performance experience).
Please don’t mind us merging your thread into Invisible thralls (PS4 PRO) so other players and our team can benefit from this finding.
We’re currently testing performance on PS4Pro systems and trying to find the cause for the streaming and stuttering issues.