I don't know much about the area that I'm talking about, but wouldn't the following help:
You know how when you rate a manga, for example, its rating stats and placement on the chart updates right that second.
It seems that a lot of things in this site updates almost instantaneously. It's not a bad thing if you look at it from a normal perspective, but how heavily does this impact the site? If it's one of the major things that causes these errors, I suggest that these trivial things refresh every few minutes or hourly.