sorry for the problem caused to you.
As to check your problem,
1.) how about your other browser? ) Does this situation happened in all files or individual ones ?
(If it is also slow,it may be the network problem,plz consult with your local network operator for advice)
If the problem only with uc, you could clear cache and disabling the extensions one by one, check the fire wall settings to see if set any limitation for that.turn on/off speed mode/cloud boost.
Also you can send su the screenshot and specific link to test Thanks~