[TYPO3-english] Workspace is very slow after upgrade

[TSniper]

Hello,

I'm working with other member on typo3 Workspace on 4.6 version, after upgrade to 6.2.4 the workspace is now very slow loading page tree and contents to edit. i think he is doing a long and heavy requests.

My think is this due to in typo3 core:
 $versions = $this->getWorkspaceService()->selectVersionsInWorkspace($this->getCurrentWorkspace(), 0, -99, $pageId, $parameter->depth, 'tables_select', $parameter->language);

Does  any body have an ideo how to resolve this ?

Thanks