Nokia Communication Centre - Slow calendar and contacts

Nokia PC-Suite (Nokia Communication Centre) brings two new features - Contact and Calendar editors.

That is great for people that do not run MSOutlook and similar but want to edit the contacts in the phone.

For every calendar item you edit it immediately updates the phone and makes a lengthy readback of data before the user can continue working with another item.

If a contact is deleted it updates to the phone and scrolls the contact list to the top.

Gives a JAVA app kind of slowness feeling. What is wrong?