Web page slowly loading

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Hello

some of the web site could not loading
Or slowly loading
But the download and upload speed is good
There is only  problem in opening web pages
I realized the problem DTLS
I closed DTLS
connecting With TLS
page load problem was solved
  But TLS Not Good
One other thing
I connected with the DTLS
Then I use a proxy
Everything was so good after use Proxy
Web pages loading, download, upload, ...
I do not know why
But after connecting DTLS
  And the use of proxy
The problem is solved
Also
My connection is this :
DTLS
RSA_AES_128_SHA1
(Fedora 20 64Bit , gnutls-devel-3.2.10 )
Maybe the problem is DTLS V 0.9
Also
DTLS V 1.2  not works for me


Alex