Diagram Refresh Rate Slow

I have just installed JDeveloper 11.1.1.1.0 on Fedora. When ever I open a database diagram the refresh rate is slow. It takes several seconds for the diagrams to refresh. I used to have this problem with large diagrams on windows. Has any one else experienced this as well. Any help would be appreciated.

What immediately comes to my mind, since several problems have been reported, is the new X server 1.7 and kernel mode setting (introduced with kernel 2.6.31 and enabled by default).

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