> Can you give me the steps to checkout your repo. I am not familiar with git. (I am on a linux machine with git installed)
To start with, it's probably worth trying the latest git code that's definitely going to be part of the next 1.2 beta which is at availably with:
git clone git://git.mantisbt.org/mantisbt.git
In addition, we have nightly builds of 1.2.0a3 at http://www.mantisbt.org/builds/
Also, i'd be interested to know if removing the call to project_cache_all at the end of core.php has any noticeable effect on the mantis installation with your workload.