I am currently using TestComplete Version 6.12.283.7 running Windows XP SP2. The project I am currently working on runs off of our network and has extreme lag time. Tests are taking over 20 minutes just to start! Is there any setting that can be changed to fix this problem?
My advice would be to fragment your projects. Try to use different suites/projects for testing different tests. In our usage of TestComplete, refreshing the namemapping seems to be the biggest time eater in our tests, since we have hundreds of objects mapped. That file can get big pretty quick. And having to refresh the mapping can lead to significant time delays.
Another possible "slow down" is the initialization of any ODT objects up front. Any ODT objects present in the project need to be initialized in memory. If you have an "excessive" amount, this could account for slow down.