c# - More effective way to change runtime terrain Unity? -

in unity game players able chop down trees using example axe. tree gets removed terrain , replaced falling tree prefab. works fine in small scale. looking more effective way though, because:

• the entire terrain needs reloaded if tree cut down. if terrain large , complex means entire game freezes few seconds whenever tree cut down.
• it works poorly in multiplayer. in order terrain stay in sync, players terrain needs reloaded each time tree cut down. means everyone's game freezes every few minutes.

i have thought "chunking" terrain entire terrain built , don't know of way break parts after has been made.

any ideas appreciated! i'm intermediate level programmer don't need write code me here, need idea or suggestion best way this?