Comment 3 for bug 1846438

If you are unable to share the design, perhaps you can bisect the issue to determine a smaller commit range where the issue first occurs. My tests on the most complex board I have do not show substantial slow down on loading currently.

Two other options:
- If you can share the design privately, my e-mail address is available on my user page and I can take a look at it offline.
- Alternatively, there are some commercial KiCad support options that provide bug fixes for cases like this where designs may need non-disclosure agreements with a specific entity.