Is there a way to move/rename an object?

There is a way to copy files. To do a rename/move, you'd have to delete the original as shown below. This is just copied from the CF developer guide:

4.3.3. Copy Object

Suppose you upload a file with the wrong object name or content type, or you needed to
move some objects to another container. Without a server-side copy feature, you would
need to repeat uploading the same content and then delete the existing object. With
server-side object copy, you can save the step of re-uploading the content and thus also
save the associated bandwidth charges, if any were to apply

There are two ways to copy an existing object to another object in Cloud Files. One way
is to do a PUT to the new object (the target) location, but add the “X-Copy-From” header
to designate the source of the data. The header value should be the container and object
name of the source object in the form of “/container/object”. Also, the X-Copy-From PUT
requests require a Content-Length header, even if it is zero (0).
PUT /<api version>/<account>/<container>/<destobject> HTTP/1.1
Host: <storage URL>
X-Auth-Token: <some-auth-token>
X-Copy-From: /<container>/<sourceobject>
Content-Length: 0

The second way to do an object copy is similar. Do a COPY to the existing object, and
include the “Destination” header to specify the target of the copy. The header value is the
container and new object name in the form of “/container/object”.

COPY /<api version>/<account>/<container>/<sourceobject> HTTP/1.1
Host: <storage URL>
X-Auth-Token: <some-auth-token>
Destination: /<container>/<destobject>

With both of these methods, the destination container must exist before attempting
the copy. If you were wanting to perform a move of the objects rather than a copy, you
would need to send a DELETE request to the old object. A move simply becomes a COPY +
DELETE. All metadata is preserved during the object copy. Note that you can set metadata
on the request to copy the object (either the PUT or the COPY) and the metadata will
overwrite any conflicting keys on the target (new) object. One interesting use case is to
copy an object to itself and set the content type to a new value. This is the only way to
change the content type of an existing object.

hi

If i use one of that two methods to move/rename object(1,X-Copy-From 2,Destination), i want to know, if that will become a bottoleneck ?

In particular, there is a large number of users while simultaneously

Thks