Nokia Communication Centre - Slow calendar and contacts

Nokia PC-Suite 7.1.18.0 (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.

However:
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?