Similar problem here. And not to mention trying to Add a final test point or two.... That could take 10 Or 15 minutes. I have finally resorted to "disabling" my dynamic fill and totally Moving the plane layers off the board. I know that sucks but it does help to Improve the response time. Try moving just the ground planes off and see What kind of increase in response time you get. I think you will be surprised. Our typical cards have four ground planes and getting those off the routing area Increase the response time. Yes this sucks. Cadence, are you monitoring this? Please? -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Paul_Keefe@xxxxxxx Sent: Thursday, May 19, 2005 3:06 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: System requirements for 15.2 I have a single 2.8 ghz with 2 gb of memory and two 21" monitors in my office laying out similar boards with 900 "matched" diff pairs and many positive shapes. The lag between my home 1ghz / 1gb of memory is so bad that I spend more time in work. I don't really wait to often but I also try to add the planes in at the end of the layout. The dual monitor setup is so good I'll never go back to just one. Whether using CM to highlight nets, groups or Concept to crossprobe between it and Allegro. We started with one 21" and an old 17" monitor and liked it so much we invested in another 21". Paul Keefe george.h.patrick@xxxxxxxxxxxxxx Sent by: icu-pcb-forum-bounce@xxxxxxxxxxxxx 05/19/2005 05:44 PM Please respond to icu-pcb-forum@xxxxxxxxxxxxx To icu-pcb-forum@xxxxxxxxxxxxx cc Subject [PCB_FORUM] Re: System requirements for 15.2 I have a dual 2.66 GHz Xeons w/ 2 GB of memory. I still get lags on large boards with lots of planes. I am going to try 3 GB of memory (the most I can stick in it), but there was almost NO improvement from 1 GB to 2, so I don't think that's going to help :( There are some differential pairs that have a 20 second lag in them from the time I start sliding to the time they actually move. Sure would be nice if Cadence would multi-thread Allegro so it could actually USE both processors. It's going to get worse as Intel switches to multi-core processors instead of increasing bus speeds. -- George Patrick Tektronix, Inc. Central Engineering, PCB Design Group P.O. Box 500, M/S 39-512 Beaverton, OR 97077-0001 Phone: 503-627-5272 Fax: 503-627-5587 <http://www.tektronix.com/> http://www.tektronix.com <http://www.pcb-designer.com/> http://www.pcb-designer.com It's my opinion, not Tektronix' -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Sawyer Jayne Sent: Thursday, May 19, 2005 14:34 To: icu-pcb-forum@xxxxxxxxxxxxx Cc: Anderson Gary; Cech Charles Subject: [PCB_FORUM] System requirements for 15.2 Since moving to 15.2 and positive planes we have been experiencing considerable lag time when running DRC, using the electrical constraints for diff pairs or doing edits to the planes. The boards we are having issue with are 17" X 14" 16 layers 23477 connects 24000 via We are looking to upgrading our hardware. I am hoping that some one in the group might be working with similar conditions and already have updated to a machine that could handle it. If any one can help me to spec a capable machine please let me know. Thanks in advance, Jayne Sawyer