While the server is cloning objects, the client cannot move the avatar.
Using the default world data from 20080911 server build as a repro case, do the following:
Connect as the only client to the server. Walk outside the building and zoom the view out afar.
Open Create.. tab and select select/move objects panel.
Select as many objects as possible (~50 or more).
Holding shift, move the objects in the world using the repositioning control.
Release LMB.
The server log will now start outputting following:
"
...
14:54:57 - [DATASTORE]: Adding obj: 92611b23-debc-4408-8685-1ce972805e22 to regi
on: befb7ca2-beee-4469-9199-784ff918f3f9
14:54:57 - [DATASTORE]: Adding obj: 946f50de-df7b-420a-a5b8-bf5f305b6c57 to regi
on: befb7ca2-beee-4469-9199-784ff918f3f9
14:54:57 - [DATASTORE]: Adding obj: 5505f0d1-a267-4b00-ad72-018aeee154f2 to regi
on: befb7ca2-beee-4469-9199-784ff918f3f9
14:54:57 - [DATASTORE]: Adding obj: 89224978-fd59-4f5b-9c48-3a43e5caef8c to regi
on: befb7ca2-beee-4469-9199-784ff918f3f9
...
"
While this happens, the moving the avatar.
Looks like the server doesn't respond to the client, or the movement simulation is paused while the update is being performed.
Expected: Movement simulation can be carried out simultaneously while the objects are being cloned, or if that is not possible, a dialog item will signal that there is no connectivity problem, but a costly world update is being performed.
Reproducibility: 2/2
Tested on server version 20080911 and client version 20080915.
A related issue: Just before releasing the LMB, start moving the avatar and while the avatar is moving, release LMB. The user cannot control the avatar, but it will continue walking in the direction before releasing the mouse button, eventually walking off the edge of the world and falling outside the scene.
Reproducibility: 1/2.