several applications use as much as CPU as they can while starting up.
This takes one and sometimes several minutes.
I'm using WinXpPro SP3. I suspect it is the registry or a service that is not started but should or maybe a replaced driver/DLL.
It happens with and without firewall and AV and even in safe mode.
It happens to browsers, explorer.exe, and others. Not sure what the correlation is.
Once started the program is as quick as ever.
Please shine a light on this. Since I don't know what info you desire I'll wait on your request.