AI Systems Performance Engineering by Chris Fregly - is it worth it? [D]

I found this book "AI Systems Performance Engineering" by Chris Fregly [1].

There is another book "Machine Learning Systems" by harvard [2].

Which book is the best of option to learn about optimizing/high performance ML / Deep Learning?

[1] - https://www.oreilly.com/library/view/ai-systems-performance/9798341627772/

[2] - https://mlsysbook.ai/book/contents/core/efficient_ai/efficient_ai.html