You can try to clear cache and cookies,switch speed mode,and check Firewall Settings, disabling the extension one by one via menu->Manage Extensions.
If no use, what browser you are using?
How about send us the link to test?
Thanks for your prompt reply.
Does it only happen in some specific site or all websites?
Where did you download UC PC browser?
Pls kindly tell us the above info so we can further check it,thanks a lot.
Have a nice day~