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Reading and writing in JSON, Plist, YAML and XML data made simple when the data format is not known at build time. Swift library and command-line tool. (by ABridoux)
Not 100% sure but you might find Scout interesting for your needs
A much faster version of JSONDecoder
Check out ZippyJSON.
Appwrite - The Open Source Firebase alternative introduces iOS support. Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
Parsing gigabytes of JSON per second
It’s a Swift wrapper around simdjson and a drop-in replacement for JSONDecoder. The performance should be pretty good.
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
Faster Java with the Vector API - JEP Café
1 project | reddit.com/r/java | 15 Mar 2023
Trimming spaces from strings faster with SVE on an Amazon Graviton 3 processor
1 project | news.ycombinator.com | 13 Mar 2023
Attempting to parse JSON at light-speed with Raku and simdjson
4 projects | reddit.com/r/rakulang | 15 Feb 2023
I/O is no longer the bottleneck
1 project | reddit.com/r/programming | 30 Nov 2022
Rust and C++
2 projects | reddit.com/r/cpp | 12 Nov 2022