With the latest RUST update,
AdminRadar caused a significant delay during server startup,
"Cached 5708/87622 entities in 254.9109605 seconds!"
Do you have any idea what might be causing this?

Hi, a delay is expected because the plugin yields to the server until it is able to finish caching. I couldn't say exactly why yours is taking longer than expected because it's not my server.

(10:51:01) | Loaded plugin Admin Radar v5.4.3 by nivex

(10:51:06) | [AdminRadar] Cached 15569/90157 entities in 4.786087 seconds!

It is still working normally here though, the only broken option is voice because I expected the ddraw.text to be out by now so I will likely release an update to address that specifically.