Kicking - "consuming a whole lot more resource" is hardly fair either. It is not enough of description to identify the problem. Would need to know specifically what the issue is - CPU usage, Memory usage, GDI or USER objects, Handles, etc.
Which version are you using? There were some previous versions that were consuming more system resources, but that has been addressed in current production and beta versions.
If you are using a current version (3.7.6B or higher) then we would need to see specifically what your settings are and compare to the version that you say used less resources. If this is the case, then email QT support with the setting.