I've noticed some weird and inconsistent issues as well, shortly after
moving to OpenDNS, but it is probably just coincidence.

These probs can be pretty difficult to track down, and typically the
only way to really tell where the problem lies is to perform a packet
capture, and analyze the time difference between DNS queries and
answers.  You may also find that your HTTP sessions may be taking a
long time either to negotiate a 3-way handshake, or even further along
in the application stream.  So the problem may not even be related to
DNS... but some of the many services the site has embedded in it's
pages.

Culprits I've seen are google analytics and other various counter
sites can slow down page loads, giving the impression that the
requested page is slow, but in actuality only a small piece won't
load, blocking the page from completing it's download.

I would 1st, set your computers DNS entries manually to the OpenDNS
servers.  This cuts out any weird caching or resolution issues on your
router.

If that yields the same result... try using other public DNS servers,
e.g. 4.2.2.1, 4.2.2.2, 4.2.2.3, 4.2.2.4.  To test them before you add
em, do the following:

dig @4.2.2.1 www.google.com

If you continue to have trouble, you could install your own cache-only
DNS server locally on your machine, and set your DNS entry to your
loopback of 127.0.0.1.

Beyond this... you're left with either local network issues, e.g.
router, wireless, etc... or even upstream ISP probs which are a little
more challenging to troubleshoot.

--
Gilbert Mendoza
PGP: 0x7403B303
Email: gmendoza at gmail.com
http://www.savvyadmin.com
https://launchpad.net/~gmendoza
https://wiki.ubuntu.com/GilbertMendoza

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