This should be reported in Report an Issue so that it will be seen by the TS folks that work for FileMaker Inc. To the best of my recollection, there have been no such reports for specific HP printers printing slowly so this may be new information if no one has brought it to their attention in previous reports.
But there have been other reports where printing did not go well for specific combinations of FileMaker version, printer and OS. And it's not uinusual for the person making the report to note that other apps print just fine. That can happen for the simple fact that FileMaker interacts with printer drivers in ways that can be very different than the print jobs generated from other applications. Thus, if there's a bug in the printer driver's code, FileMaker might trip over that bug where other apps do not.
In other such cases with other reported printer specific issues, an update of the printer driver or FIleMaker was needed to resolve the issue.