Performance issues with multiple queries (XML/php/Flash)

Hi I’m building a Flash website with database information with php>mysql>xml>Flash mx 2004. I’m having some major problems!

I need to retrieve information of different tables in mysql, and was worried about performance issues.

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The first query gets the whole model list…
The second query will be performed after a model is clicked. Something like: select * from modelinfo where modelID=modelIDinFlash.

The third query is what I have a lot of trouble with! This has to run on the same time or immediatly after the second query. It reads the picture urls and id’s from that particular model. I need the filenames for the picture viewer.

But everytime I try this third query, the site becomes very slow and have problems displaying the model info.
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NOW I have a temporary solution: in the first table I have a field which states how much pics each model has, and this number Flash uses to build the nr buttons. But this is not a very solution since I want to keep everything dynamic. I also want to build a drag and drop function… something like a shopping cart. For that to work, every picture must have an unique ID!

I hope someone has some tips for me on this matter! How to deal with 3 XML queries…

This is the link if you need to know what I’m talking about:
http://www.eyecatchers-models.com/v1/

Thanks in advance!