Performance after upgrades

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Hi,

I have two sites on the same server and one of them is very slow compared to the other one. I tried to find out why and discovered that one of the websites had been updated a couple of times with the dashboard updater.

I then tried to put both sites on a brand new server with only those two websites and profile them with zend server and zend studio.

The result was that the update_core_check.php file took twice as long to load on the site which was updated.

The site which has been updates takes 1500ms - 5000ms to load.
The site which haven't been updated yet is between 400ms - 2000ms.

So, is there a way to clean up the updates, is this a bug somewhere and how can the updated site be performance boosted to achieve the same load times.

cbox