Product and version FileMaker Pro 15.0.1
OS and version: Windows 7&8
Hardware - Multiple Windows compatible machines
We have been having slow downs since upgrading our clients to 15. The Server starts to spike in CPU usage on 4 cores. I used the Top Calls logs to notice that during the slowdowns, which can last for 30 minutes or more, at least one person is logged continuously for that same time period with a High Total Elapsed Time, and the operation of Query (Find).
Today, I happened to figure out the person causing the slowdown by looking at this log while it was happening. I went to their desk, and they were not even at the computer, it was sleeping. When we woke up the computer, the user was on a layout, no scripts running, a single text field was clicked on to highlight, but the cursor was not in it. Quitting FileMaker alleviated the slow down. (Verified by looking at the log)
This layout is in a different file than the one listed in the Target column of the log, but does reference fields through portals from the Target listed in the log.
I was able to verify this behavior on multiple Windows machines, but not on Macs. They behaved normally.
How to replicate
Go to layout that has portals and fields from another file, highlight a field, and wait a few minutes.
Workaround (if any)
downgrading to Client 14 for now.
log and video of screen is available if needed, but might have confidential data on it, that I might have to get approved.