I've found that a lot of my games revolve (at least locally) around efficiency. My shapes seem heavy and slow, I was wondering if there are any resources (books, pro games, etc.) That are particularly useful to remedy this. Thanks

Two books: Making Good Shape by Bozulich and van Zeist, published by Kiseido, and Shape Up! by Charles Matthews available on line at GoBase.

You can build better shapes if you know all the standard move types, meanings and directions and the principles for good extensions as described in Joseki Vol. 1 Fundamentals. Also consider local alternatives by Local Move Selection instead of playing just the first move you think of. Efficiency is explained as a strategic concept and by the analysis methods Local Positional Judgement and tewari in Joseki Vol. 2 Strategy.

http://home.snafu.de/jasiek/Joseki.html

Haengma books can at least be interesting.

https://www.yutopian.com/yutop/cat?prod ... tegory=PAK
https://www.yutopian.com/yutop/cat?prod ... tegory=PAK

I doubt either will help you more than reviews, but they will make you think about different shape moves.

I used to have this problem too. (Actually, I still do, it's just gotten a little better over time). The following were a few things that helped:

Studying and getting the feel for common ways of making shape in tight positions. Driving tesuji, flying off orthogonally, counter-hane, attaching under on the second line, crosscuts. Sensei's library has a few pages to illustrate the basic idea, and many tesuji books have a number of examples involving these.

Playing many 2-4 stone handicap games as white.

Looking over pro games, with a focus on how they develop their shapes, which choice of move they use to defend a weakness, how they settle or sacrifice an invasion.

And watching Magicwand's malkovitch games for inspiration and fighting spirit.