Thank you pauland!
That explains the iframe loading time. However, the T-shirt editor is loaded by iframe as well and loads straight away even though it is way bigger like you found out. (I think they are changing that to html5 soon)
Does anybody know of a different solution to an iframe? In any way, I don't think I will be able to fix this and the loading time seems to be okay in other countries so thank you all very much for your help!!!!
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