Did you actually get an alert about "high load" from the hub? Because otherwise, this isn't that necessarily concerning: yes, this particular app is 73.2%, but that's 73.2% of 3.0% (which what the "of busy" means in this column; the total busy time/percent is listed above the table).
If the sensors you use for this automation send frequent events, that could cause this. If you don't think that's right, I'd verify what devices are in use by this automation, make sure the devices themselves aren't sending lots of events unexpectedly (e.g., motion active, contact open, etc.), or consider re-creating that Room Lighting instance if there's a chance something went wrong. Enabling all logging may help you show what the app is waking for and when, or sharing the setup here (e.g., as a screenshot) might help others figure something out.
Otherwise, I wouldn't be concerned about this if you're basing this entirely on this statistic.
