One post carries 30 postmeta values, is this too much?

No, to be honest 35 is nothing. You should not see any problems scaling this into the hundreds/thousands if optimized right, it does depend on many factors.

Where is the post meta being used, are you sure it’s all being used?

Are you using a lot of unique keys? You can check this by doing get_post_custom_keys, the lower the better.

Are you outputting all post meta in one shot using get_post_custom instead of getting each field via get_post_meta ?

You should always turn on debugging with define('SAVEQUERIES', true); and see how many hits to the DB your doing and how long each one is taking.

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