[vdr] Vdr or driver performance dropout

I've noticed that earlier when I was using PIII 550 MHz and vdr 1.3.22 (or something about) I made a test by recording nine channels simultaneously and watching a recording at the same time. I remember there seemed to be no trouble doing it. Now when I have vdr 1.4.4 after fourth recording starts vdr becomes sluggish and there starts to come errors on log: dvb-ttpci: warning: timeout waiting in LoadBitmap when pushing menu button. And ofcourse no menu appears or menu appears only partly.

Is this vdr related or firmware related. After all the error is fw error isn't it?

\Kartsa