On a Mid 2011 Mac Mini with 16GB of RAM it takes about eight seconds to fully load aircraft in California and areas further from a reset. It loads much faster after that, around three seconds, with a refresh and whatnot already in the cache.
A minute later I tried using a Mac Mini 2023 with an M2 chip and 8GB of RAM and it took less than two seconds for the same full area of California and all the aircraft in it. I did this test on both just after 6PM PT today (0100 UTC). Both machines use an SSD as their main drive and my down/up speed is at least 300 Mbps and 20 Mbps.
Are you using a VPN? Are you using WiFi? Your load times could be affected by those amongst other things.