deeper - 4:38 pm on Nov 14, 2012 (gmt 0)
up to WP 3.3 having more than 50 or 100 pages in WP often slowed down the performance. It was recommended to choose an url beginning with a number.
Then it was fixed in 3.3, this post explains the details:
As it is very "technical" I don't undesrstand this solution completely.
Is the problem fixed now however I create my permalinks, with or without using the permalink tool of WP, whatever permalink setting in WP or manual creating/editing of the url-slug I choose? Or is there a case which is not fixed?