My experience has been just like others'. It is very random and I can detect no set pattern to the odd behavior.
Sometimes even the thumbnails and small images on the site seem to take forever to load. In general, the website has been acting a little odd since either the merge or the switch to the new server. The "jump to new post" feature has also gotten flaky for me.
It still functions better than other gardening websites, but just not as well as it did a few months ago.