Thanks for your help. I really appreciate. Sorry for my late response.
I don’t know exactly what you mean with type. There is a table called ‘type’ (in PHPmyAdmin) and for all the WordPress-tables it shows ‘MyISAM’.
I guess it’s properly indexed. Someone adviced me once to index the field ‘comment_date_gmt’ in wp_comments, and that is – as far as I know – the only change I’ve made in the database.
Can you tell me how to check if it’s properly indexed?
Thanks!