Implementing fastCDC is fun (2016).
Do you have a suggestion on what to read on the topic since then?
I don't keep up with these things. A quick search came up with the following but I haven't read it yet.
Fan Ni and Song Jiang, "RapidCDC: Leveraging Duplicate Locality to Accelerate Chunking in CDC-based Deduplication Systems", in Proceedings of 2019 ACM Symposium on Cloud Computing (ACM SoCC'19), Santa Cruz, CA, November, 2019.