We have a few large classes (large number of attributes and large number of objects), e.g. one with 19 attributes and ca. 1300 instaces/objects.
Often it is impossible to add another attribute: each new attribute has to be added separately, and even that often fails: the system stalls and the class becomes "pendant" or nothing happens - the page keeps loading. Sometimes the attribute is actually there if you manually stop the browser from loading.
Often the attribute can be seen in the class itself, but when you edit an object of the same class the new attribute is not visible.
We assume that the problem has to do with the combination of the large number of attributes AND a large number of objects (we have a few classes with 50-60 attributes, but only one object - these classes works fine)
Solutions?