Hi Dave, Sorry for the long time between posts. Great comment, This was the last thing I thought of, I reduced the lookahead buffer which reduced the delay a little but still having the problem.
I finally got my cpu and heatsink for the upgrade. The problem upgrading began with the size of the computer. It's a small form factor desktop Compaq EN which resides in the box space under the lathe and because it fits so nicely I would have had problems to find a newer computer to fit. I decided to upgrade the existing 733Mhz processor, relying on Ebay and alot of info hunting I found I could upgrade to 1400Mhz Tualatin cpu providing I had a converter socket for the differing voltages.
Well I ended up buying a 1266Mhz chip, big difference pricewise £20 or £60 for the 1400. Waited for the converter to arrive from Hong Kong and planned what I'd be doing before everything arrived, I'll upgrade the bios before doing anything else to it.
The next problem once the bits arrived was finding that once all the parts were assembled the heatsink was a tad too tall as the hard drive has to fold back down over the cpu to get the lid back on.
I trimmed the heatsink with the trusty linisher and mounted the fan on the side. I crossed fingers and switched on, Success! Booted first time and once convinced the heatsink was doing it's job I fitted the machine back into the Orac.
Once into Mach3 I took advantage of the highest kernel setting without a crash and setup a program to run.
I found immediately that the 'end chatter' problem I had miraculously disappeared completely and the delay between G1 then a G0 command is hardly noticeable.
I guess the moral of this is,
Just because you can load Mach3 on a slower computer than recommended, It isn't necessarily a good thing!
Many thanks for all your advice and I hope this post will be helpful to others
Kind Regards
John