QtCreator MSVC debugging unusably slow

I didn't use the debugger for some time, but after trying to start it today (after updating to 4.1.0) I found it is really slow.

For example, I opened and compiled the basicshapes-cpp example with Visual Studio 2015 Update 3, setting a breakpoint in the first line of code of main().

After loading all the symbols (when it shows "Starting debugger "CdbEngine" for ABI "x86-windows-msvc2015-pe-64bit") it takes 1 minute 45 seconds (every time, even with correctly setup symbol catch) to go to the breakpoint.

From there, jumping from the line "QApplication app(argc, argv);" to the next with F10 takes another 70 seconds, and so on.

As it is, this is completely unusable to debug anything. It works fine in Visual studio, where starting and jumping to the next line takes less than 5 seconds or so (instead of 3 minutes).