Dear all, This sounds very similar to my continuing speed problems with SPM99 , SGI's Irix 6.5.9 and Matlab6...we are now accustomed to Registration taking many hours. It seems to help to start matlab without the gui interface >matlab -nojvm But I can't help thinking that it may be important to optimize SPM99 for the new matlab in some way....I look forward to hearing more discussion of these problems. Dianne Patterson University of Arizona -- Original Message -- >Dear colleagues working with SPM, > >I installed SPM99 under Matlab6 and SuSE Linux 7.0. Everything is working >fine. During coregistration, in the step of segmentation my system becomes >very slow. The whole procedure takes about four hours. On a similar system >with SPM99 under Matlab5.2 and Linux the procedure takes about only 10 minutes. > >What could be my problem? > >I would very much appreciate your expertise in responding these question. > >Sincerely > >Burkhard >