Leptris puts a hard ceiling on XML parsing

Why it surfaced

This is unusually specific systems software: one contiguous arena per document lets the project promise a memory ceiling before parsing begins. Its homepage also publishes benchmark methodology, a 438/438 W3C XPath score, and bindings for Ruby and Python rather than hiding behind generic performance claims.

Leptris is a pure-C99 XML 1.0 parser with XPath 1.0, SAX streaming, zero required runtime dependencies, and bounded memory allocation.