when backup file is found, system slows down

[ilippert]

JabRef version

Other (please describe below)

Operating system

GNU / Linux

Details on version and operating system

JabRef 5.8--2022-08-16--6a71395 Linux 5.18.17-200.fc36.x86_64 amd64 Java 18.0.2 JavaFX 18.0.2+2

Checked with the latest development build

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

0. ... open two libraries
1. ... change something in both libraries, do not safe, but wait for bak files to be generated
2. ... kill the programme
3. ... open JabRef
4. ... user is asked whether to restore from bak files.

effect: system utterly unresponsive until I act on the choice.

Appendix

No response