QTL: Debug build faster than release build?

[tuli]

I am working on some lengthy algorithms, which basically read a file in, process its ocntent, and write the results back to another file.
For a given file x, which is use for testing, the debug build took 6 seconds to completely process the file.
I was happy with this result, compiled it in release mode - and the same code with the same file took 9 seconds.

DId a full recompile of the whole projekt - same.

In the algorithm, i make heavy use of the QTL (specifically QMap, QVector, QMultiMap), and this is the only thing i can think of that might be causing all this through some black magic.

As i said, it's a lengthy pice of code, and i was not able to pin it down to a specific line or area. Though i will continue to try.

Any ideas on this?

IDE: VS2008ProSP1 + qt plugin
Qt: 484
hw: i7 + 8gig ram