So I tried loading two campaigns to see how they loaded differently. The first one was an arena test to try out class mod's in which the other player pre-downloaded the same mods. The second was my main campaign in which they did not have the mods pre-downloaded. If I list all my downloaded mode it would be over 60. Maybe a little excessive but since there isn't the ability to export characters how else do you plan a long campaign.
When we loaded the main gm mode campaign all but 2 of the mods self installed on their pc but we stopped the loading at 10 minutes.