Showing a hidden forms very slow

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Hello

I just upgraded my lazarus fom svn 27288 to 27453 and i have a problem with hidden forms
I use Linux ubuntu 10.04 fpc 2.51 and gtk2.

Displaying a hidden form previously created take about 2 seconds with the new SVN version.
With old SVN displaying the form was instantaneous.

I tried several versions and the problem seems to appear since SVN 2714.
Before it'ok after it's slow.

anyone experiencing this problem ?

thanks