Prevent Asset Manager from auto-loading during studio server+client playtests

When playtesting with server + clients the Asset Manager loads my inventory and eats up performance displaying the results, resulting in performance hits during the first minute of every play test (freezing every few seconds)!

It’s something small but persistently grating, it would be perfect if the asset manager did not load automatically during a playtest - a button could be in place instead to begin loading if necessary.