Rendering Lag? Wait for the models to render?

My game has many assets and when I build and run it, I notice slight lag as it loads the level and starts up. Is there anything I can do to reduce this lag? I'm also using Photon Networking so as it connects and the player spawns, there is some lag. If you play for a while, however, you go back to the average 60-80 fps, so I can tell this is a rendering problem.