Internal Device Control request

I have a kmdf usb bus driver to connect usb virtual device. In this the device is configured/installed in the usual manner as below:
1. Create a PDO for the child device by supplying h/w id and other ids of the device
2. The usb stack(usgccgp.sys) then requests descriptors of the device using InternlaDeviceControl
3. The bus driver supplies the requested descriptors in the transfer buffer supplied by usgccgp.sys (eg:_URB_CONTROL_DESCRIPTOR_REQUEST)
4. The usb system then sends tne next request.ie control or bulk transfer request via InternlaDeviceControl
It is seen that , step 4 takes some to arrive. ie.once a request is satified by the bus, the next internal device control takes a little long to arrive causing
noticebale delay. This delay was noted by using DbgPrint messages in DbgView.
In another situation I am forwarding a read request coming to the bus driver to a manual queue of the same device using WdfRequestForwardToIoQueue(). After this also, and internal device control is expected to arrive but it arrives quite late.
Why is this so? Is this delay expected? Any inputs from someone with similar experice would be of great help.

Thank you Doron. I haven't set synchronisation scope or execution level but I had mentioned the dispatch type of the queue of the child pdo of the bus driver as sequential. Changing it to parallel seems to solve the issue for the most part. As we know
the internal device control arrives at the pdo. I have set the dispatch type of the fdo(bus driver) as sequential itself. I hope now the request arriving at the child pdo will be delivered to the driver as soon as it arrives.
i

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