Performance of my permalink structure?

I have read the discussion on the performance of different permalinks on the wp hackers mailinglist, THIS forum and around Google.

I could however not really deduce if the permalink structure I have been using for the past years is good or not:

/%postname%-%year%%monthnum%%day%.html

This combination put the postname directly after the / and the year,month,day combination makes it more unique since many postnames carry the same name. The html addition is something I have been using for the past 10 years on my blog (even pre wordpress) so that is legacy.

I dont know if this is good for permance or bad for performance, how can i check this?

(I have been running the blog for +10 years and there are about 10.000 posts with many links in)

links:

1. http://codex.wordpress.org/Using_Permalinks

2. http://www.google.com/search?q=wordpress+category+permalink+performance

3. Category in Permalinks Considered Harmful

4. http://lists.automattic.com/pipermail/wp-hackers/2010-October/035458.html

You can check by looking at the size of the rewrite_rules option in the database. If it’s small (which I believe it should with this structure), you’re not using verbose rules. By contrast, if you see several lines per static page, you’re using verbose rules and it’s not good.