slides load very slow after publish

I have made a project with a few slides containing a drag and drop excercise. It's not big yet, it's only a start, but I wanted to show it to our customer already to hear his feedback. So I published the course to try it. On my desktop, where I develop, it works good, but when I move it to the network and try with a company pc, then it goes very slow... On the 3th slide (after the menu) there are 5 objects, clicking on the objects shows different layers. When the page is loaded and I start clicking, nothing happens. I have to wait for a while (half a minute, a minute, ...) and after that it works.... The same with the following slides, every time I have to wait a while until it works...

What can be the reason?? There are not many slides, so that can't be the problem... Some slides have a lot of triggers, maybe that's the reason?? But that's the great thing about storyline, so it shouldn't be a problem...

I did notice that storyline generates a lot of .swf files, a lot more than other courses I did before, maybe that's the reason? But what can I do to avoid this??