[solved]why debug(using cdb) is so slowly?

[twicave]

my Qt version: 4.8.4.
compiler: vs2010.
cdb is coming from Microsoft DDK.

My project has 15 also sub-projects, most of them is static lib(several of them is dynamic lib.)
When I try to debug in one sub-project,
It takes about 10~20 seconds(even more) from one line to another in QTCreator.
I can't endure such delay. It should be I have done something wrong.

help me , please.

[moved, koahnig]

[twicave]

I have found the reason:
in multi-module project.
if you add a evaluation into debug "watch" panel.
then the debug efficiency will slow down significantly.