I have been running 1.3.5-SP4 and have now just upgraded to 2.0.8.
1.3.5 is installed to the root of my site and running so fast that it is a dream to use…all that was done was to up the mem in the config file to 64meg.
I installed 2.0.8 following the upgrade instructions to a folder off the root and it is running like a dog. I upped the mem from the default 48 to 64 and that made a slight difference but we are still talking 8 secs between page views or even after you scroll the mouse wheel.
2.0.8 is not workable to make my cosmetic changes like adding blocks, creating pages etc so I am scared to remove my 1.3.5 version.
Anyone else having MAJOR speed problem with 2.0.8 and if so have you done anything that has helped?
Thanks!
Installed a fresh copy of 2.0.8 and works perfectly so the upgrade following CS-Carts instructions has cause the problem 
If you have the stats addon installed and active, you might want to turn it off.
The stats addon from my testing seems to slow everything down.
Yet I still have it on. :mrgreen: