I do not recommend this course. I am a 3rd year backend developer and have never improved performance in a project. The course content is only about introducing caching, indexing, and asynchronous processing methods, and comparing ngrider and scouter to show the difference in performance when using the above methods and when not using them. I think there are many more in-depth and detailed articles on velog than this course. The reason the lecture video is short is because it ends at the introduction level. I got an early bird discount and bought it for 43,000 won, but I think 20,000 won is appropriate. This 20,000 won is worth the curriculum related to performance improvement and the Notion page where interview answers related to the content are organized. Since 10,000 won is not a small amount of money for a current job seeker, I am leaving a review. For those who are a little diligent, it would be a good idea to just Google the titles of the lecture curriculum and study them separately.