Here is what we found on #photogrid from instagram. 24 908 722 posts total.
Higher is better. #photogrid engagement rate represents users engagement and interactions when you post something with this hashtag. User engagement shows you how many users are going to like or comment your post.
50 posts per hour.
Posting speed of hashtag photogrid shows you how many media is posted with tag per hour. If this value more than 500 hashtag is very popular, but your post will go down in the list soon.
If you looking for hashtags that will give you likes, comments and followers you should use hashtags with higher engagement rate and posting speed between 5 and 10.