Avoid distracting the reviewer by making sure the commit focus on one thing.
Do one thing, and do it well
The larger a commit is the more effort it is for the reviewer to check it, increasing the risk for review fatigue where the reviewer is more likely to overlook issues in the patch. More focused commits are smaller and therefore less likely to cause this. If the commit in addition to just being large also contains multiple separate features it adds extra burden on the reviewer as the reviewer also have to figure out which of the features a change belongs to.
If the subject of the commit message includes the word "and" it usually is an indication that it should be split.