Slowness after upgrading to 3.8.0

I've just upgraded my board to 3.8.0 and ofcourse used the vbseo.php people here suggested to upload specially to 3.8.0.

What I've noticed is that after this upgrade the board got a little slower than normal.

Server load as still in average as always and tracert the same.
When I disable vBSEO pageviews got pretty fast.

Does someone here noticed the same ?

I think I found the solution for this.

Right here: Links not working after site transfer

As DB for User Groups has changed on 3.8.0, Sitemap Generator was stocked. When I applied the solution from this link and run sitemap gerenator I could see the the last report showed instead of just a few seconds that normally takes, it showed days (but like a zillion seconds).