Html Template got rejected ! Feedback Please

Today i’v got reject my portfolio template , please give me some feedback why my template can be reject.

http://uipark.net/demo/

Hi,

I have see your item demo its taking long time to reload or opening page speed is not ready.
its not opening at here.just like infinity loading http://prntscr.com/mke5yn
can’t see your demo.

thanks!

Error info contact:

but your design is very good.

Regards.

Thank you sir for your feedback.
Do you think slow loading is the only reason for reject !!
Or maybe have there any other reason ?