@leocg Great, but we have to go back and forth between Windows task manager and Opera's task manager using the PID to identify each process. It will be user's friendly to have directly the task's description from Opera in Windows task manager.

By the way, why all processes from Opera's task manager aren't in Windows task manager?

@leocg Thank you very much for this useful information.
This is exactly the kind of display that I would like to see in the Windows' task manager, but we can't link a task in the Opera's task manager and the corresponding process in the Windows task manager.
For example, I actually have 31 tasks in Opera's task manager while there are only 17 processes in Windows' task manager; informations (memory, CPU, Network) for each element aren't identical, so it's difficult to link an Opera task with a Windows process.
For example, in Opera, I have some "rendering engine" tasks with "Not Available" in "Memory Footprint" column and we can't stop the process. Not knowing which Windows process corresponds to this task, we can't try to end the task in the Windows Task Manager.

When I look in Windows Task Manager, I see 35 "Opera Internet Browser (32 bit)" processes but I only have 9 tabs open in Opera. Some of these processes consume more memory and CPU resources.

In order to manage them, it would be very practical to have a more detailed description of each process linking it to the tab (web page) or to a particular operation (download, edition of the list of favorites, etc.).