I have one toon which lags occasionally as well. It took me a long time to figure out that it was tied to my internet connection. The single toon lag-a-thon is mainly at night, after 9 AM or so, and usually lasts until 3-5 AM. I live in a small town and the internet is more of a "new fangled thing" so there are probably no more than 4 or 5 people in the area who know anything about packets and latency. The internet company will work with you a bit, but asking about slowness in the middle of the night would be useless. So I put up with the one toon that lags, and I've grown accustomed to closely watching for it.

Dismounting high up on a mountain side and afterwords noticing that one toon has suddenly fell to their death, has taught me to watch for it, especially when flying.