You can expect some loading delay the first startup (or after MS release an update), because there is a WASM module that is being recompiled, so there's a delay like each and every other product that comes with WASM modules.
Subsequent startups shouldn't take much longer than they used to, but surely *some* delay at startup will be seen, because lots of objects has been added to the simulator library, so just like any other product that adds lots of objects, like AI traffic packs, boat packs, birds pack, replacement car traffic packs, etc, they ALL contribute to the startup time.
I timed the startup now, and it takes exactly 2 minutes and 20 seconds, from clicking to the MSFS icon to getting to the Main menu.