However, this editor seems to be very slow to load and few more problems we face every 10 minutes publishing articles.

Is there any definete/perfect alernative to same ? free or commercial >?

Our requirements:
1. Multiple pagination of article,
(Main page of article, page 1, page 2, etc.)

2. Automatic image thumbnails

3. Easy editing image properties

4. All the clean and tidy features common to all editors (including tables)

5. W3C compliance.