Here’s a helpful, practical guide on troubleshooting issues. This is a common frustration for diesel techs and fleet managers, but the good news is that most causes are fixable without reinstalling everything. Why Cummins INSITE Loads Slowly (And How to Fix It) If INSITE takes several minutes to start, hangs on the splash screen, or is sluggish opening menus, the problem is rarely the engine or ECM—it’s almost always the PC environment, network settings, or data buildup . Below are the most effective solutions, ranked from quickest to most advanced. 1. Disable “Check for Updates” on Startup (Most Common Fix) By default, INSITE tries to contact Cummins servers every time it opens. If your internet is slow or the server is unresponsive, the software hangs.