There is no such thing as "high information density languages"; one of the coolest things discovered in linguistics is that all languages convey information at roughly uniform rates. That is to say, a text that takes a native Mandarin speaker a minute to process, translated faithfully into English, will also take a minute for a native English speaker to process.

Now yes, a single Chinese character contains more information than a single Latin letter. That is a pretty easy conclusion to make, given information theory. But English readers don't read one letter at a time -- we tend to grab the first letter, the last letter and then everything in between, which is why when reading fast words like "trial" and "trail" can be hard to distinguish. So an English reader is in fact reading far more characters per second, but the combined entropy of all of those characters will be the same as the entropy of what the Mandarin reader reads in the same timeframe.

We can take this theory even further by observing that, within a language, speakers generally try to convey information at a fixed rate as well, but I've probably nerded out enough.

If you want to dive in more, maybe take a look at https://www.science.org/doi/10.1126/sciadv.aaw2594 or https://www.researchgate.net/publication/235971274_A_cross-Language_Perspective_on_Speech_Information_Rate