Slow 'exporting feedback as .csv' performance

[juliankehne]

Describe the Bug

Not necessarily bug, could just be an enhancement to make exporting feedback .csv's faster.

Exporting regional feedback as a csv. takes way longer than would be expected for the amount of feedback selected.

Not sure how long it would take if you would ever export a larger amount.

Steps to Reproduce

1. Go to Testumgebung
2. Go to Feedback
3. Select 1 or 2 feedbacks
4. Export as .csv (bulk action)
5. See that it takes 1+ minute to export

Expected Behavior

Exporting feedback only takes a few seconds for each feedback selected.
On https://admin.integreat-app.de/ it shouldn't take 40 seconds to export two feedbacks.

Actual Behavior

Exporting feedback takes a long time

Additional Information

Tested on cms-test (Testumgebung) = 1+ minute.
On admin it takes ~40 seconds to export two feedbacks as a csv.

Traceback