TestExecute vs TestComplete Execution Speed

In our environment, I write the automations on one system, then we use our TE licenses to execute them on other machines (or I run it in TC on the machine they were written on). We are just now starting to do these distributed tests, so this is the first time we've actually used TestExecute.



I completed a rather lengthy test, and tried running it on another machine with identical hardware. The test runs in 90 minutes on my machine, it takes nine hours to run in TE on the other.

I loaded up TE on my machine and ran with TestExecute instead of TC, and it only took the 90 minutes. 



I have reviewed the tips at http://support.smartbear.com/articles/testcomplete/test-playback-performance-tips/ , but nothing there helps.



Any ideas why  TE runs faster on the machine that has TC installed, but many times slower on identical hardware that doesn't?