If you click on the actual line with a date it should expand to show details - for example, clicking on the “Failed while executing…” line should expand to show more info about errors that might have occurred.
Is there any difference if you set the --thread-priority lower?
--thread-priority
Selects another thread priority for the process. Use this to set Duplicati to be more or less CPU intensive.
Default value: “normal”
When you’ve upgraded to 2.0.3.4 or newer you might also want to look at enabling --use-background-io-priority to see if that has any effect:
--use-background-io-priority
This option instructions the operating system to set the current process to use the lowest IO priority level, which can make operations run slower but will interfere less with other operations running at the same time
Default value: “false”