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Dolphin has become very slow after recent update

Dolphin has become slow recently. In particular, adding or moving a bookmark in the Places panel has a delay of several seconds.

To reproduce, create a new bookmark in Places or move an existing bookmark up or down in the Places panel. There is a delay of a few seconds. Previously, there was no noticeable delay. I now experience these delays 100% of the time.

Just now I timed it and there is a delay of about 5-6 seconds before the moved bookmark appears moved, then there is a delay of another second or so before Dolphin's GUI is responsive again.

Also, if I leave Dolphin open all day, even normal navigation from location to location also becomes very slow. To reproduce, navigate to any location using Dolphin. There is a delay of several seconds before Dolphin refreshes to show the new location. During this time the Dolphin UI is unresponsive (Dolphin appears frozen briefly). Previously, there was no noticeable delay. I only experience this if Dolphin has been open for a while. If I close and reopen it, I do not get the very long delay when navigating to a new location.

I'm running KDE on Arch.  Here's some system info:
  • plasmashell --version: plasmashell 5.12.5
  • dolphin --version: dolphin 18.04.0
  • Linux 4.16.6-1-ARCH #1 SMP PREEMPT Mon Apr 30 12:30:03 UTC 2018 x86_64 GNU/Linux
The previous time I looked at my version, I had plasmashell 5.12.3 (a couple months ago). Dolphin was fine in that version. So the problem started after that version, but it may have appeared before my current version. I first noticed it several weeks ago. Nothing about my system has changed other than normal Arch updates.