I needed more options in my command line. I ran the game with “-trace=default,assetloadtime,tasks -statnamedevents” and got more info.
The AssetLoadTime channel will enable blueprint and asset names and “-statnamedevents” adds more profiler events from the old stats profiler.
The tasks channel gives you more info when hovering over the “Waiting for Tasks” events.
It should show additional info per task and it will draw colored arrows to the tasks that are being waited on.
That works only for the tasks that are run through the built in tasks system, though, so some waits won’t have additional info from this channel.