After closing emails the navigation will be reloaded -> slow

After update from 7.0.x to 8.5.1+FP2+FP3 some of our users have the problem, if they open an email and close it again, the left frame of the mailfile containing the outline (navigation) will be reloaded. That takes quite long (2 or more seconds after each email). Using the preview pane is a workaround, but of course they want also use the standard open and close of an email.This occures on Win2K and WinXP, using DWA7 and also Mail851.ntf, but only in the MailFrame, not in the CalendarFrame.

Does anybody have a solution?

thanks in advance

Subject: after closing emails the navigation will be reloaded → slow

Yes, I have the same problem. I suspect that this is because some bug of eclipse.

Subject: Basic Client - no eclipse

I forgot to metion. We use basic client, no ecplise.