deeper - 5:38 pm on Nov 3, 2012 (gmt 0)

@smithaa02:
Thanks for your comprehensive comments and your patience. May be you have a bit more.

I won't use index.php in my urls ever, that's sure.
The "bad need" of index.php in the url: Is that something I will notice with my eyes when creating new pages or something going on in the background of WP?

Why should I ever be faced with index.php in my urls apparently, when I

-set "postname" in the custom permalinks,
-edit the slug for every page individually when creating pages,
-adding .html by using a plugin
-tell WP my site-Url (without index.php) in the general settings and
-set a static front page in WP



Nice to hear that the plugins are simple and fast. Thanks for the tip with memcache, I will ask my hoster.

As they are simple they should be easy to fix in the WP editor when - may be some day - a plugin doesn#t work with a new WP-version and is not supported any more, right?