Similar questions are here and here
My case is I\'m using Qt 5.5 with Qt creator 3.5 on a Windows 10 machine. It takes about 10 to 15 seconds to start debugging my p
When updating to Qt 5.6.1 in a Windows 10 (Redstone) with Visual Studio Professional 2015 (Update 3), I also faced an epic slowness with cdb.exe. The process (cdb.exe) would just hang Qt Creator for 30+ seconds after the build ended and before the debugging started.
If others face such slowness, and had no luck caching the symbols, I would like to share that by downloading the Windows 8.1 SDK, installing only the Debugging Tools and re-opening Qt Creator, I was able to update the kit to the auto-detect 8.1 debugger (cdb.exe) and everything started working properly again.